Footstep sounds would be cool. But as far as I know it would require changes in the blockhead model if you want to use FootSoftSound/FootHardSound/etc. in the playerdatablock (correct me if I'm wrong). That doesn't mean it's impossible. I think it would be easy to make with schedules. It checks every second if the player is moving. If yes, is there something he's standing on, and if yes, play a sound.