A sound pack is a wonderful idea...I'm sure with all of the computer/web savy individuals here we could amass a large amount of different .wav files, which could be used for all kinds of mods...and I'm sure it would be useful as well when SE5 comes out.
ive allready tested some sounds and they work ok,
apart from the timing,some of the weapons repeat fire to fast so u dont hear the full sound all the time