Note to self: Don't ask questions over Easter weekend!
In case anyone else ends up having a similar question, I'll post the system we settled on to handle substitution of injured players during the playoffs:
- You may petition the commissioner to replace a player suffering from a short-term injury on your playoff roster. Only players whose names appear in red or gold within OOTP qualify for potential replacement.
- You MUST contact the Commissioner in writing and receive confirmation prior to [your league's sim time] on the first sim night of a playoff series for this exchange to happen. The Commissioner reserves the right to deny a requested replacement.
- As part of your written request, please include where you would like the replacement player to be inserted into your lineup/rotation/depth chart.
- If your replacement request is granted, DO NOT make the change to your roster yourself! The Commissioner will do it for you.
- The replacement must take place before a series starts. No mid-series replacements will be allowed.
- The replacement player must be on your 40-man roster and have been in your organization on Sept. 1. He does not have to have been called up to the majors at any point in the season.
- The replacement player's position does not need to match the position of the replaced player. So a pitcher can sub for a hitter and vice versa.
- If you advance to the next round, you may choose to keep the replacement player on the roster or reactivate the replaced player. If you reactivate the replaced player you may not use the replacement player for the remainder of the playoffs (barring another injury).
- At the conclusion of your playoff runs (be it through victory or elimination), the replacement player will be removed from your active roster and the replaced player will be added back on. This will be done by the Commissioner; there will be no need for intervention on your part.
Also note that our league places restrictions on playoff rosters similar to MLB. Only players on the DL or the active roster at the time of September roster expansion are eligible for the post-season. This is something you have to police yourself; OOTP doesn't do it for you.