I disagree that the current mousewheel action is useless. When you have a lrage number of tracks it’s very handy.
However, extra functionality could be provided by use of modifier keys..
eg
Just Mouse Wheel – vertical scroll (as now)
Shift Mouse Wheel – horizontal scroll
Ctrl Mouse Wheel – vertical zoom
Ctrl+Shift Mouse Wheel – horizontal zoom.
if playing with the modifiers corrupts other standard functions, then it may be better to have a user definable options for what the mousewheel affects.
Other than that, good topic to bring up 🙂
DSP