Moving Users to new Storage Groups

I am planning on spreading out my users to all four available storage groups on Exchange 2003 SP1 (Enterprise) to make a restore that much faster (one storage group at a time, instead of all users in one storage group). I don’t want to change the information stores and their locations on the F: (stores) drive, but is there a way that I can re-point an information store in one storage group to another (make a new mailbox store reference and point to the *.edb and *.stm..or do I have to mailbox move all of the users into the new stores? Any help is appreciated! 🙂