In general, scrolling with the mouse wheel does work fine, at least on the mice that I have access to. I just spent some time cross referencing how Sublime Text handles WM_MOUSEWHEEL messages (http://msdn.microsoft.com/en-us/library/ms645617(VS.85).aspx
), and there does seem to be a problem when faced with mice that use a delta smaller than 120/tick: perhaps your mouse is a smooth scrolling one that does this?
I'll add this to the todo list for the next beta. I can't be sure this is the exact reason for what you're seeing, but it does seem reasonable.