Just discovered this today and bought it with a little donation. I was searching for a tool like this for ages. FPSC wasnt what i needed, RGM was too buggy, your tool ist just right :)
I think what would really be great was if there was some kind of demo-game with all the features possible, that you can open and edit in the Editor. Nothing artistically, just basic stuff, one enemy, a room, some triggers and sounds etc.
Also - as i like to have my FPS games as bloody as possible, Gibs and bloodsplats to walls would be nice, everything like the over the top Brutal Doom :)
Again, you did a really, really nice job with that! Huge respect!