I have chosen to use the 1, 2, 3 keys of the numpad to switch between warrior stances, paladin auras, druid shapeshifts, etc. The "key bindings" in the default game menu natural to the game allow this. I cannot remember the exact name of what you should be looking for in the long list, but I seem to remember it being called special ability 1, 2, etc. (I am at work and cannot verify at the moment)