Hi Mike,
Let's me identify problem cards or cameras, etc.
You can already include the camera model in the auto-renaming set-up.
If you have multiple card readers, the auto-renaming feature allows you to specify the drive letter so if a particular reader was always used for a particular card (label it) you would get that ID in the file name too.
This would be ok. if you did not have too many cards and an equal number of readers - you do know FP can read multiple cards in one session.
Fred's idea is very straightforward because FP allows you to add text to an auto produced sub folder name.
Terry