Currently sound can be either looped or played once and deleted.
This is problem when playing such sounds as shooting - if it's loaded every shoot fps is going down. And it's hard to use looping if sound::time() returns something like -.2.

wav is faster for processing than ogg

Possible but using ogg fps goes down about 25% - I don't think wav will be much faster.
Is it hard to make sound stop/pause (but not delete) after one play?

wav is much faster
delete doesn't change anything