If you mean that the scrolling is too slow, this has been fixed in v0.4 (so you will be able to enjoy it in the next public version). Otherwise, what is your problem? You can't zoom at all?
Hm.. that's weird, I will ask my Mac testers if they have any problem with the v0.5 alpha, and I will hear from you once the v0.5 public is out to know if you still have that problem.
