I believe time-to-read type reading stats used to work in sideloaded kepubs up to fw 2.6? or 2.8? but don't work in the current 3.x fw.
As far as fonts are concerned, font thickness and sharpness settings are, by default, restricted to most (not all) of the built-in fonts. In addition:
- if you 'cheat' and name your sideloaded fonts (internally and externally) with one of a few (4 at last count) font names. Then thickness/sharpness adjustment is also available. I wouldn't call this cheat 'hacking'.
- There is also a
real hack which
does make thickness/sharpness available to all sideloaded fonts. If you're not interested in hacking, fair enough, but don't assume applying a Kobo hack is anything like as complicated as jailbreaking and layering hacks on a Kindle. To a technical guy, such as yourself, it's done in a couple of minutes (maybe a bit longer the first 'nervous' time).
Finally, also be aware that a correct Kobo answer today may be an incorrect Kobo answer next week, and vice versa, if there's a firmware upgrade in the middle
