I'm reviving this bug, as it's still pretty relevant.

The main issue with the scrolling in the Animation window is:
(see the attached picture)

When you mouse over the time line (1) and scroll, the time line alone will expand/shrink. When mouse over the other axis - the value axis (2) - and scroll, both the value and time axis will expand/shrink.

This is very counter intuitive. Only the value axis should be changing when you mouse over it and scroll - the time line should stay still.

Please poke me on Skype, if something is unclear:)