@samhayman.. not quite, but the effort is appreciated :-)
In Sonar 8 (and under) I would incessantly: - select a time region and n tracks
- "SHIFT-S" - this does 'zoom to selection' (now CTRL-ALT-H I think)
- <do whatever>
- hit "u", which is like an 'undo last zoom change'.
I do this a lot and it's doing my head in not being able to find it in the help or the menus. I'll bet it's obvious when I do find it.. I didn't realise how much use of keyboard shortcuts I made until I switched.