Floppy187,
In my F150 the steering wheel radio control buttons could be assigned to ANY of the functions available through the SWI-PS used for the control of the radio. Doing a quick search on the pac-audio site turned up the folowing instructions for your car.
Sounds like the installer didn't know how to set it up or the function combination you were looking for is not available...the specific setup instructions are found on THIS PAGE
You can see that all of the following options are available when installed properly in your 07 Civic (taken from the linked page):
Programming