One problem with setting a minimum usage rate (to keep players "happy") is that we'd be force to misuse players in the same way real clubs do. Just because the Cubs want to give 500 ABs to Mickey Morandini (or 200 to Manny Alexander) doesn't mean I should have to give them even a fraction of the ABs. One of the draws to SIM-ball is that we get a chance to manage teams better than what we see happening in real life. We are limited on the upper end - I wonder how much it would speed the development of Julio Ramirez if I could give him 500 ABs as a rookie; oops, can't - it would be too bad to be limited at the lower end for dog players.