Hi Justice,
For my side, I'm playing almost only RPG...
Anyway, I just took a look on vJoy, the virtual gamepad used. I noticed that a virtual gamepad can be created using 8 axis, 128 buttons, 4 POV hats...
To compare, the official xbox gamepad for windows has 6 axis, 11 buttons and 1 POV hat.
As your touchscreen gamepad works as a feeder, it looks like more controls (virtual buttons/joystick/slider/...) could be added on the screen to simulate any controller.
I find the way to customize the ArtistPad through the App quite practical and why not to get the same for the gamepad with basic forms?
As all tablets don't have the same size, everyone can setup its own gamepad in order to fit the game and the screen size.
Regards,