diff --git a/frontend/apps/reader/modules/readerdogear.lua b/frontend/apps/reader/modules/readerdogear.lua
index 472a0ad57..f7f2f8b74 100644
--- a/frontend/apps/reader/modules/readerdogear.lua
+++ b/frontend/apps/reader/modules/readerdogear.lua
@@ -56,16 +56,9 @@ end
 function ReaderDogear:onReadSettings(config)
     if self.ui.rolling then
         -- Adjust to CreDocument margins (as done in ReaderTypeset)
-        local h_margins = config:readSetting("copt_h_page_margins")
-                       or G_reader_settings:readSetting("copt_h_page_margins")
-                       or G_defaults:readSetting("DCREREADER_CONFIG_H_MARGIN_SIZES_MEDIUM")
-        local t_margin = config:readSetting("copt_t_page_margin")
-                      or G_reader_settings:readSetting("copt_t_page_margin")
-                      or G_defaults:readSetting("DCREREADER_CONFIG_T_MARGIN_SIZES_LARGE")
-        local b_margin = config:readSetting("copt_b_page_margin")
-                      or G_reader_settings:readSetting("copt_b_page_margin")
-                      or G_defaults:readSetting("DCREREADER_CONFIG_B_MARGIN_SIZES_LARGE")
-        local margins = { h_margins[1], t_margin, h_margins[2], b_margin }
+        local configurable = self.ui.document.configurable
+        local margins = { configurable.h_page_margins[1], configurable.t_page_margin,
+                          configurable.h_page_margins[2], configurable.b_page_margin }
         self:onSetPageMargins(margins)
     end
 end
diff --git a/frontend/apps/reader/modules/readerfont.lua b/frontend/apps/reader/modules/readerfont.lua
index a66f2a70c..10c7cb423 100644
--- a/frontend/apps/reader/modules/readerfont.lua
+++ b/frontend/apps/reader/modules/readerfont.lua
@@ -25,8 +25,6 @@ local ReaderFont = InputContainer:extend{
     font_face = nil,
     font_menu_title = _("Font"),
     face_table = nil,
-    -- default gamma from crengine's lvfntman.cpp
-    gamma_index = nil,
     steps = {0,1,1,1,1,1,2,2,2,3,3,3,4,4,5},
 }
 
@@ -179,43 +177,14 @@ function ReaderFont:onReadSettings(config)
     self.ui.document:setHeaderFont(self.header_font_face)
 
     self.ui.document:setFontSize(Screen:scaleBySize(self.configurable.font_size))
-
-    self.font_base_weight = config:readSetting("font_base_weight")
-                      or G_reader_settings:readSetting("copt_font_base_weight")
-                      or 0
-    self.ui.document:setFontBaseWeight(self.font_base_weight)
-
-    self.font_hinting = config:readSetting("font_hinting")
-                     or G_reader_settings:readSetting("copt_font_hinting")
-                     or 2 -- auto (default in cre.cpp)
-    self.ui.document:setFontHinting(self.font_hinting)
-
-    self.font_kerning = config:readSetting("font_kerning")
-                     or G_reader_settings:readSetting("copt_font_kerning")
-                     or 3 -- harfbuzz (slower, but needed for proper arabic)
-    self.ui.document:setFontKerning(self.font_kerning)
-
-    self.word_spacing = config:readSetting("word_spacing")
-                     or G_reader_settings:readSetting("copt_word_spacing")
-                     or {95, 75}
-    self.ui.document:setWordSpacing(self.word_spacing)
-
-    self.word_expansion = config:readSetting("word_expansion")
-                       or G_reader_settings:readSetting("copt_word_expansion")
-                       or 0
-    self.ui.document:setWordExpansion(self.word_expansion)
-
-    self.cjk_width_scaling = config:readSetting("cjk_width_scaling")
-                       or G_reader_settings:readSetting("copt_cjk_width_scaling")
-                       or 100
-    self.ui.document:setCJKWidthScaling(self.cjk_width_scaling)
-
+    self.ui.document:setFontBaseWeight(self.configurable.font_base_weight)
+    self.ui.document:setFontHinting(self.configurable.font_hinting)
+    self.ui.document:setFontKerning(self.configurable.font_kerning)
+    self.ui.document:setWordSpacing(self.configurable.word_spacing)
+    self.ui.document:setWordExpansion(self.configurable.word_expansion)
+    self.ui.document:setCJKWidthScaling(self.configurable.cjk_width_scaling)
     self.ui.document:setInterlineSpacePercent(self.configurable.line_spacing)
-
-    self.gamma_index = config:readSetting("gamma_index")
-                    or G_reader_settings:readSetting("copt_font_gamma")
-                    or 15 -- gamma = 1.0
-    self.ui.document:setGammaIndex(self.gamma_index)
+    self.ui.document:setGammaIndex(self.configurable.font_gamma)
 
     self.font_family_fonts = config:readSetting("font_family_fonts") or {}
     self:updateFontFamilyFonts()
@@ -284,7 +253,7 @@ function ReaderFont:onSetLineSpace(space)
 end
 
 function ReaderFont:onSetFontBaseWeight(weight)
-    self.font_base_weight = weight
+    self.configurable.font_base_weight = weight
     self.ui.document:setFontBaseWeight(weight)
     self.ui:handleEvent(Event:new("UpdatePos"))
     Notification:notify(T(_("Font weight set to: %1."), optionsutil:getOptionText("SetFontBaseWeight", weight)))
@@ -292,7 +261,7 @@ function ReaderFont:onSetFontBaseWeight(weight)
 end
 
 function ReaderFont:onSetFontHinting(mode)
-    self.font_hinting = mode
+    self.configurable.font_hinting = mode
     self.ui.document:setFontHinting(mode)
     self.ui:handleEvent(Event:new("UpdatePos"))
     Notification:notify(T(_("Font hinting set to: %1"), optionsutil:getOptionText("SetFontHinting", mode)))
@@ -300,7 +269,7 @@ function ReaderFont:onSetFontHinting(mode)
 end
 
 function ReaderFont:onSetFontKerning(mode)
-    self.font_kerning = mode
+    self.configurable.font_kerning = mode
     self.ui.document:setFontKerning(mode)
     self.ui:handleEvent(Event:new("UpdatePos"))
     Notification:notify(T(_("Font kerning set to: %1"), optionsutil:getOptionText("SetFontKerning", mode)))
@@ -308,7 +277,7 @@ function ReaderFont:onSetFontKerning(mode)
 end
 
 function ReaderFont:onSetWordSpacing(values)
-    self.word_spacing = values
+    self.configurable.word_spacing = values
     self.ui.document:setWordSpacing(values)
     self.ui:handleEvent(Event:new("UpdatePos"))
     Notification:notify(T(_("Word spacing set to: %1%, %2%"), values[1], values[2]))
@@ -316,7 +285,7 @@ function ReaderFont:onSetWordSpacing(values)
 end
 
 function ReaderFont:onSetWordExpansion(value)
-    self.word_expansion = value
+    self.configurable.word_expansion = value
     self.ui.document:setWordExpansion(value)
     self.ui:handleEvent(Event:new("UpdatePos"))
     Notification:notify(T(_("Word expansion set to: %1%."), value))
@@ -324,7 +293,7 @@ function ReaderFont:onSetWordExpansion(value)
 end
 
 function ReaderFont:onSetCJKWidthScaling(value)
-    self.cjk_width_scaling = value
+    self.configurable.cjk_width_scaling = value
     self.ui.document:setCJKWidthScaling(value)
     self.ui:handleEvent(Event:new("UpdatePos"))
     Notification:notify(T(_("CJK width scaling set to: %1%."), value))
@@ -332,8 +301,8 @@ function ReaderFont:onSetCJKWidthScaling(value)
 end
 
 function ReaderFont:onSetFontGamma(gamma)
-    self.gamma_index = gamma
-    self.ui.document:setGammaIndex(self.gamma_index)
+    self.configurable.font_gamma = gamma
+    self.ui.document:setGammaIndex(gamma)
     local gamma_level = self.ui.document:getGammaLevel()
     self.ui:handleEvent(Event:new("RedrawCurrentView"))
     Notification:notify(T(_("Font gamma set to: %1."), gamma_level))
@@ -343,13 +312,6 @@ end
 function ReaderFont:onSaveSettings()
     self.ui.doc_settings:saveSetting("font_face", self.font_face)
     self.ui.doc_settings:saveSetting("header_font_face", self.header_font_face)
-    self.ui.doc_settings:saveSetting("font_base_weight", self.font_base_weight)
-    self.ui.doc_settings:saveSetting("font_hinting", self.font_hinting)
-    self.ui.doc_settings:saveSetting("font_kerning", self.font_kerning)
-    self.ui.doc_settings:saveSetting("word_spacing", self.word_spacing)
-    self.ui.doc_settings:saveSetting("word_expansion", self.word_expansion)
-    self.ui.doc_settings:saveSetting("cjk_width_scaling", self.cjk_width_scaling)
-    self.ui.doc_settings:saveSetting("gamma_index", self.gamma_index)
     self.ui.doc_settings:saveSetting("font_family_fonts", self.font_family_fonts)
 end
 
diff --git a/frontend/apps/reader/modules/readerpagemap.lua b/frontend/apps/reader/modules/readerpagemap.lua
index 4928c58f6..a2beb6a89 100644
--- a/frontend/apps/reader/modules/readerpagemap.lua
+++ b/frontend/apps/reader/modules/readerpagemap.lua
@@ -87,9 +87,7 @@ function ReaderPageMap:resetLayout()
 end
 
 function ReaderPageMap:onReadSettings(config)
-    local h_margins = config:readSetting("copt_h_page_margins")
-                   or G_reader_settings:readSetting("copt_h_page_margins")
-                   or G_defaults:readSetting("DCREREADER_CONFIG_H_MARGIN_SIZES_MEDIUM")
+    local h_margins = self.ui.document.configurable.h_page_margins
     self.max_left_label_width = Screen:scaleBySize(h_margins[1])
     self.max_right_label_width = Screen:scaleBySize(h_margins[2])
 
diff --git a/frontend/apps/reader/modules/readerthumbnail.lua b/frontend/apps/reader/modules/readerthumbnail.lua
index 6b2c76f68..cb4465522 100644
--- a/frontend/apps/reader/modules/readerthumbnail.lua
+++ b/frontend/apps/reader/modules/readerthumbnail.lua
@@ -421,7 +421,7 @@ function ReaderThumbnail:_getPageImage(page)
         -- will be croped out after drawing), we will show them just as rendered.
         self.ui.rolling.rendering_state = nil -- Remove any partial rerendering icon
         self.ui.view:onSetViewMode("page") -- Get out of scroll mode
-        if self.ui.font.gamma_index < 30 then  -- Increase font gamma (if not already increased),
+        if self.ui.document.configurable.font_gamma < 30 then  -- Increase font gamma (if not already increased),
             self.ui.document:setGammaIndex(30) -- as downscaling will make text grayer
         end
         self.ui.document:setImageScaling(false) -- No need for smooth scaling as all will be downscaled
diff --git a/frontend/ui/data/settings_migration.lua b/frontend/ui/data/settings_migration.lua
index d36444259..88130bafc 100644
--- a/frontend/ui/data/settings_migration.lua
+++ b/frontend/ui/data/settings_migration.lua
@@ -43,11 +43,6 @@ function SettingsMigration:migrateSettings(config)
         local space_condensing = config:readSetting("copt_space_condensing")
         logger.info("Migrating old", cfg_class, "CRe space condensing:", space_condensing)
         config:saveSetting("copt_word_spacing", { 100, space_condensing })
-        if cfg_class == "book" then
-            -- a bit messy that some settings are saved twice in DocSettings, with
-            -- and without a copt_ prefix, and they must be in sync
-            config:saveSetting("word_spacing", { 100, space_condensing })
-        end
     end
 
 end