Hi Bob I like to have as many 'one finger' keyboard shortcuts as possible in SONAR - I find it especially useful when I'm tracking guitar and bass.
I've customised my shortcuts so that the four arrow keys control the four zoom controls so the
↓ key expands all tracks vertically, the ↑ key contracts all tracks vertically, the → key zooms in horizontally and the ← key zooms out horizontally. Just an idea!