Hi Shawn
If you add the left to the right and the right to the left channel you get get a "mono signal".
This addition makes the signal louder in total.
Therefore PowerPan got a parameter to suppress (-3dB ... -6dB) this "effect" when we pan the two signals to the center.
Cubase:
"Right-Click" on the panner of an audio channel. Now you are able to choose between 3 options. Balance, Dual or Combined... or something similar.
The "combined" option is similar to the PowerPanner. Further, I believe we can adjust the panning law some where within the settings of Cubase.
Unfortunately I'm not able for the moment to click around within the program ;-)
Nevertheless, since I own the Suite I always use a powerpanner in each channel and I don't use the one of Cubase. The SuitePanner treats the process "monoizing and panning" far better (sound).
Best
Beat