I kinda like the current format to be honest.  I don't watch the game or really give a rats-ass but I think it's a good "prize."  If I had to pick an alternate, I think I'd go with a cage match.  I'm not sure about which position to use though ... on the fence between traveling secretaries and closers.  Split the difference and do tag-team cage match?

Alternate: most balls caught during home run derby.  Participants should be their team's most rabid fans.  Not sure where they should be positioned but I sometimes think it should be standing on tables at the 2nd deck rail.  I think this forum has a few potential participants.