Not sure you wanna ask ME that one.. hehe.. just kidding

Actually, you might wanna PM Our resident Mac/Maya guru "Danny Ngan" in our Melscripting section.

He'll know better than I about using Mac hardware with Maya I presume

You could also talk to your Alias rep, as I'm sure they'll know of any shortcuts in the event you cannot get a 3-button mouse.

Good luck!