USB Tablet and Extended Desktop - Swap Monitor

I have a Genius GPen 4500 USB graphics tablet (using the built-in Windows 7 driver), and would like to use it on my secondary monitor (which is 4:3, unlike my primary which is 16:9)

However, windows seems to have decided that the tablet is integrated into my primary monitor (according to "Tablet PC Settings" in the control panel - it shows "Pen Input Avaliable" for the "1. BENQ E2220HD" item and "No Pen or Touch...." for the "2. SyncMaster" item)

Running "Setup" from that window does not work, as the tablet still maps to the primary screen, and can't be used to click on the second screen.

Is there any way (even a registry hack) to change which monitor is used? Or to update the range for the tablet such that it maps to the second screen.

If it helps, the setup is a classic horizontal setup (1920x1080 on the left, 1280x1024 on the right)

P.S. Sorry if this has been asked/answered before, but both googling and a search of the forum failed, but I may not have been using the correct terms)

(I feel bad for doing this, but I would rather like an answer)
Bump, does anyone have a clue if this is possible / what I could do.
Changing the primary monitor is a possibility, but not one I would like, as I use this machine to play games, and they tend to be rather attached to the primary screen.