Just an FYI: Data\Tomes.txt currently has a 9th value for stat tome levels (25) because I was testing the changes right before I finalized the release and forgot to change it back. (I was testing for +9 tomes, and guessing that they'd be ML25. I remembered to switch 9 back down to 8, but forgot to remove the 9th value in the list.) It doesn't hurt anything to be in there.
Sure, I don't see why not. There's precedent in the Compendium already, with the sides and bottom margins there. Likely not until Update 40, though, unless some major bugs get uncovered that I need to patch.