We want to be able to set a custom value (i.e., more_options),
because on high-dpi devices, the scaling can lead to pretty large
differences; but more_options on a toggle is ugly and clunky.
So, switch to something more suited to what this actually sets,
which is ultimately an absolute pixel value, like margins.
Add a few more steps on the low end to fill out the bar (and because
that's where I found them most useful on high-dpi devices).
65ce72df27