Larry,
The above about the starter and subs with an X through their position does not work in AS/LL tournaments. Once the starter and their sub have met MPR, they can be switched in and out throughout the rest of the game. If a second sub is used, then the first sub is the one that is ineleigible for that game. Remember, the starter and any subs are LOCKED into the batting order that the starter started in, subs cannot sub for any other starter.
As per the OP, I put a small x next to the pitcher for visits, Circle the jersey number of the player that has had a SPR, change the fielding number for the players (mainly the pitcher and catcher).
I hope others chime in as to their tracking.
Thanks,
Tom