Leslie Judge and I made a little GUI based tool for NPC editing.
I didn't find JA NPC editing very difficult or anything, but considering all the different values I thought it would be nice to have something that would prevent me from forgetting values, or making errors etc.. .
Now, the tool isn't finished yet, we've tested it a lot, but there's only so much testing we can do. So we released an Open BETA. Anybody who can think of ways of improving this, please let us know.
You can find the file on PCgamemods.com here (
http://www.pcgamemods.com/3648/).
I also mailed it to Jk2files, so it should be on there between now and August 2004.