I've only been a Kobo owner (Clara then H2O2) for two months now, but in that time, the above describes all I did in terms of "tinkering". Yesterday I patched for the first time to give me the advanced font controls for my sideloaded fonts, but that's it. Then again, I've never got the whole "gotta have a good dictionary" thing either - in the 6 years I had my Kindle, I doubt I looked up 100 words on it. And in those 6 years "adding a font" was not an out of box option for the Kindle either