You really should be doing DPS. It'll help to get an MMO mouse if you have trouble accessing numbers outside a certain range, this way you'll only need to use alt/ctrl/shift and WASD/QEWASD (QE for strafing if you need to).

Trust me, doing DPS is a form of damage mitigation, it lets fights not drag on as long, and if you're not doing DPS then... what *are* you doing? Spamming heals? That's counterproductive.