One simple fix Kobo could do is fix the values used in the hyphenation dictionary.
This what Kobo use.
Code:
LEFTHYPHENMIN 5
RIGHTHYPHENMIN 5
This is what I use.
Code:
LEFTHYPHENMIN 2
RIGHTHYPHENMIN 2
COMPOUNDLEFTHYPHENMIN 2
COMPOUNDRIGHTHYPHENMIN 2
So with mine, you get hyphens with shorter words and less letters needed on the right/left of the hyphen. This is a very simple change that Kobo could do to improve hyphenation. Why aren't they doing this?