I agree about the rustiness, it just adds a degree of random silliness that doesn't help anything. Maybe not charging rustiness for the rest days might help. I doubt a day of rest after 7 months of baseball is going to make a player too rested to perform.

I also don't like the way usage works in the playoffs. If you have an everyday player who had an injury during the season and played somewhere around 130 games you wind up having to rest them in the playoffs even when healthy. Catchers who catch 120-130 games are effected most by this. Most teams that have a clear #1 catcher who catches 130 games plays that top catcher in every game of the postseason; we shouldn't have to rest them during an important playoff game. The game designates players as platoon,utility,regular etc., it should use that designation to allow everyday players to play every day when it matters most. Keep prorating the part-time guys but the best players should be available for the playoffs. Even Rickey never begged out of a playoff game.