Yes u can, i have never addit sounds...
I know its onley xml-work...but i have to figer out some thing..
That means it could be take som time.
Thats too bad because I find sound to be pretty critical in any game/movie or entertainment. If you want I can probably figure out the xml-work that needs to be done for all the sounds to work? I mean it can't be that hard. Regardless let me know if you need a hand.