In short, I don't know of an easy way.
If you were capable you could probably right a program that monitors the logs for the end of show (assuming it's logged, I have never looked) and then runs some sendkey commands to start the next one or replay the current one.
The simplest I can think of would be to attach all the files to you want to play in a row outside the TiVo and upload it back as one large show.
Peter.
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