Not sure if possible with a "CAL thing"
Would be nice to have a "GoTo previous NowTime"
 
That way if you accidentally hit Pause (which moved NowTime from where you wanted to be working) you would still have a shortcut to go back to that previous NowTime.
 
And would like the opposite also.
If I accidentally hit "Stop and return to NowTime" (instead of pause), I would like a shortcut to "GoTo last stop point".
 
These two shortcuts would nicely speed up my workflow.
 
OR it could be a key that just corrects (and does the opposite) of what you just did. Feature would be called "I meant the other way to stop". 
 

dougalex
That way if you accidentally hit Pause (which moved NowTime from where you wanted to be working)

 
This is actually a bug introduced in X3. In X2/X1 it worked properly (the Now time marker remained at its original position).
 
 

dougalex
And would like the opposite also.
If I accidentally hit "Stop and return to NowTime" (instead of pause), I would like a shortcut to "GoTo last stop point".

 
I suggest you request it in the Features & Ideas forum.
http://forum.cakewalk.com/Features-Ideas-f76.aspx