Flamestrike:
I doubt its possible to get a variety of sounds ingame, so you would be able to choose from them ingame, theres only so much we can do on the client side. But you cuold always make your own, well several if you like heh, and simply plop in the ones you like into your override Dir.
//if you like to make your own sounds for NWN, i'd be happy to send you a few pointers on how to do this, its fairly simple aslong as you possess a few sound files to replace the current sounds. Myself tried the sounds from my original BG2, which turned out pretty good. As a sidenote it takes time heh, and requires some form of sound editor. PM me if you want help getting started.