I don't really see this worth the amount of work necessary
Tons of work to get it looking nice, working in a very user friendly way, and to incorporate many, many script possibilities.
And for what? Probably just a bunch of stuffty 5 minute add-ons from people who couldn't bother to take the time to learn how to script.
I couldn't see any of the good add-on makers (at least I wouldn't) bothering with them. You'd have to learn something knew, figure out how to make it do what you already know how to do. Even people who don't know TorqueScript would stil have to learn it if they want to be good, because things like this can not cover every single thing possible to do with a language.
Maybe just a weapon/vehicle generator that you fill in text boxes and check a few boxes to add some very common features like reloading. That wouldn't be a lot of work at all. (EDIT: I just realized that was exactly what the OP suggested and the ideas of more advanced scripting features were more recent comments. Oh well)