One quote comes to my mind:
Well i guess you want as much control with your hand as possible, did you already try a mouse with several buttons? A Razer Naga comes to my mind.The Balance spec in Cataclysm has a number of interacting buffs and procs, making it currently one of the most complex classes in the game to play well. - Source
Moving only with your mouse should be possible, that's something lot of us already doing right now. What's about clicking? What results do you got with that? There are seven abilities you'll need to reach all the time:
- Insect Swarm
Another nine abilities you will need frequently or immediately:
- Force of Nature
- Solar Beam
What addons do you use to track your buffs/proccs and dot uptimes? Having clear information present to work with will help you.