A cool move. Some people regard this as basic, I didn't learn it till a couple of months ago. But it is very useful and you should learn it. It's hard with fat staffs, either with thin ones. (encourage your staff to go on a diet.) This is my preferred way of doing it, but you obviously must learn it in the other direction, and maybe you will want to learn it with all your fingers, my staff is too heavy for my pinky finger.
http://tutorials.firestaff.net/tutorials/tutorial-videos/wmv/spinning/fingerspinning.wmv (Right click, save target as... )
Streaming Flash Video: