SystemTypes should be pretty easy to make an editor for - I'll see if I can whip something out for the next version.
I've been playtesting the new DevnullMod getting it ready for release. I'm definitely at the "tweak" stage and it will hopefully be ready by late this week. Of course, I also start my new job tomorrow, so we'll see
I think I'm going to give up on the script editor though. The tree view is nice, but there's so much more to do to make it a competent editor that it's just not worth the time. Ah well, it was an interesting experiment and taught me that I don't want to get in the business of writing code editors