After looking around a bit I've only been able to find...
 
Tab to Transients: Tab = Next Transient, Shift + Tab = Previous Transient
 
and
 
Jump to Marker: Press CTRL+SHIFT+PAGE DOWN to jump to the next marker, or press CTRL+SHIFT+PAGE UP to jump to the previous marker.
 
Not saying there isn't a nav hotkey to just jump through beats/measures but it ain't coming up. Now that I think about it I may have been remember something from another DAW. If this does not exist in Sonar then I may make a feature request. It might be somewhere hidden in the unbound Preferences - Keyboard Shortcuts area (so maybe it IS possible but the binding has to be assigned by the user). Don't have time to really dig through all that right now.

lfm
I found in key bindings "go to end of this or next measure" and similar previous.
 
Assigned Ctrl+N and Ctrl+B to these.
Don't remember if they were assigned by default.
 
Then use a jog wheel with shuttle Express to move quickly in timeline.
Shuttle send these keyboard combinations you assign.
 
But what I really looked for was something that scroll window timeline line scrollbar ends do, that does not move now time, and playback - just ability to move in timeline without change of what is playing.
 
Anybody know?

Ah... thanks. I'll check that out.

I have a MCU as my Control surface, so I use the Jog wheel to move my now time marker.  I don't even know a lot of Sonar X3 short cuts because of the MCU.  Someone needs to come take this think away from me as I am too dependent on it.  
 
Save me from it's evil grip on my fragile recording life...Help!!