I don’t remember all the details around this, but I do remember it stopped working a few SUs ago. (Maybe it was SU5.) But I also found new assignments that work and are more logical. I believe you need to use the “Lockable” options.
For some reason a screenshot is not working here, so I’ll type it:
Zoom cockpit (Lockable): Mouse wheel up
Unzoom cockpit (Lockable): Mouse wheel down
Toggle cockpit view freelook (Hold): Right mouse button
Cockpit look <up/right/left/down> (Lockable): Mouse axis