I think some of the suggestions here would be close to impossible to play with a mousePAD, as the OP asked.
Don't think I'd be able to play C&C, Doom or Diablo on a pad.
IDK, i often play Red Alert 2 on my laptop, have also played Diablo 2, much better with a mouse but playable with the pad.
OP, can you not pick up a usb mouse for <£5 to use?