I noticed that the Mouse Wheel Zoom Options and the available keybindings are not well designed and in addition some of the functions are broken.
With the following settings: 1. Zoom factor set at 2.0 (or higher) for horizontal/verticall & 2. Zoom In / Out at Cursor. 3. Simultaneous zoom option turned off. Trry zooming in / out (with Shift+Alt + Wheel). Zooming stops if the zoom fector is set higher/smaller than the reminaing track height is. And also the Zoom behaviour gets erratic after a few zooms and stops vertically, and if the track buttom is not in the track view extent anymore.
The +Shift-option to make zooming faster does not work in neither mode and in neither direction.
The keybinding for horizontal zoom different on the 2 modes: for with simultaneous zoom option turned on/off
Since Track View navigation / zooming is one of the most used functions i hope this gets resolved in the near future.