Blender 2.5 View Rotation with Alt+LMB

I’ve been trying to sculpt with a tablet, and would really like alt+LMB view rotation (ALA Maya/2.49/the rest of the world) so that I don’t need to keep switching between a tablet and mouse or playing DDR with my fingertips.

I know this is possible with 2.5’s fancy new keyboard editing, but I can’t for the life of me figure it out. Anyone have any insight? (Also, why on earth is this not on by default?)

I appreciate any and all help, thanks in advance.