Mesh painting and model navigation

Trying out the mesh painting feature for the first time this weekend, and I noticed a few things that are a little strange in the UI when in that mode:
-When you enter mesh paint, the model view always zooms out. Why?
-Because the left mouse button is dedicated to painting, there’s no way to rotate the model while in paint mode. Is there a way to do this? If not, could alt+LMB goes back to the standard rotate while painting?

So far it seems to work OK. First print I tried with it sort of failed because the prime tower fell over part way through printing, but the mail model was ok, if a little ugly with extra spaghetti. Trying a second one now.