Well, as an experiment, I've implemented both the q syntax, and http://wakaba.c3.cx/sup/kareha.pl/1102984488/1 on these two boards. Try it out, and give suggestions for improvement or changes.
Seriously, though: Why not make a firefox extension or a small browser for this? There are a lot of features that could be useful for Kareha, but I doubt it would make sense to cram them all into the actual software itself.
Shamelessly bumping this to promote further improvement of navigation/linking & sucking up to 0ch! n, next100/previous100, etc. （n´✪ω✪n）
See also: http://wakaba.c3.cx/sup/kareha.pl/1099328662/21-22