Originally Posted by The Rule Lawyer
1. Lack of easy editing of creature statistics, abilities, etc.
2. Lack of easy editing of items, objects, etc.
3. Lack of easy editing of player abilities, spells, and other essential game mechanics.

I haven't ever used the NWN2 toolset so I can't exactly follow this thread except for some notes which overlap with the NWN1 Aurora Editor. I used the NWN1 editor myself and the things you mentioned above is all I miss in terms of mod creation und usability that would make things much easier in the Divinity Engine and add an extremely huge pile of joy (what did you expect I would write here? :P) on top of what's already a joyful modding experience (for me).
These three points is what made the NWN modding experience so enjoyable for me apart from the great game(play) it was made around.

RogueDeus, open the Atmosphere panel, there you go to Varia and scroll down to ambient sound. Try to use the stop button. I didn't try that so far, but it should (theoretically) stop all ambient sounds (the map-ambience such as stuff like torch sounds) and if you have music (which I never even got working nor playing in the editor for whatever reason) you can also stop the music playback.