PRV Controller editing - Help please

AFAIK, I don't think you are missing anything.  The PRV controllers pane doesn't support all of the usual Smart tools modifiers found in the Track View.  Sonar 2015 did add a "scale" velocity tool using Ctrl-SmartTool, but it does not appear to work for CC events.
 
The only method I know for "scaling" CC events in the PRV is the Process > Find/Change... dialog.
 
For example you might have a CC 1 curve with a range of 20 to 100 and you want to flatten the curve so it has a range from 20 to 75.
 
1. Select all CC 1 controllers in the controller lane.
2. Run Process > Find/Change.
3. In the "Search" dialog, clear the dialog by clicking None and click the Control checkbox.  Enter 1 for the Min and Max "Number" fields.  Enter 20 for the Min and 100 for the Max "Value" fields.  Click OK.
4. In the "Replace" dialog, change the Max "Value" field to 75 and click OK.  The curve will be proportionally flattened.
 
Hope this helps.

Hey Brundle - scook deleted that thread because I realized I had misunderstood how controllers work in SONAR_2015.
 
I actually prefer how controller events are adjusted, now. You can still select groups of controller events, or edit them individually (it's actually easier now, I think.)
 
However, I do believe there are bugs or un-finished features in the Controller Pane Editing toolset, to do with scaling and selecting. I plan to make some gif-movies of these things later today, and post them as question/bug threads.