Well I have time to do more than brainstorm, but I don't really have any experience with anything techincal in JK2 is what I'm saying. I've edited skins, units, and maps in previous games before. But I don't think it can really qualify as knowledge on how to do anything in JK2. Since every game is different from that stance, knowing something on one game is knowing nothing in another.
And yeah I'd be willing to do hardcore beta testing and balancing, if you need me.