Yah, I got one of those. The uber rare black Griffen Powermate modded with a Selectric ball.Show Image(http://farm5.static.flickr.com/4080/4741851990_e2b59449f5_z.jpg)
I use my mouse to do all of those things. I've got an MX Revolution, which i assigned the otherwise mostly useless thumb wheel as a media key. Push it forwards, or backwards changes the track in the corresponding direction. Pressing the button in pauses.