I use a Logitech G13 keypad and a Marble Mouse.
http://www.logitech.com/en-us/keyboards/keyboard/devices/5123
http://www.logitech.com/en-hk/mice-pointers/trackballs/devices/156
I use the keypad for movement, maps, character sheet, etc. With the track ball, I can click on attacks/heals with minimal motion. The mouse never moves, just the ball.
Easier for me than mashing keys, just click on what I need and I'm good to go. In fact, I slide my keyboard up and hold the track ball "sideways" underneath it. More comfortable/ergonomic that way.