I just checked the sounds we currently use for killing sprees (Killing Spree, Dominating, Unstoppable) - none of these are original GunZ sounds (they're from Unreal Tournament), so yeah no problem adding more.
Killing Spree (5 kills) > Rampage (10 kills) > Dominating (15 kills) > Unstoppable (20 kills) > Godlike (25 kills) > Massacre (30 kills)
