Or maybe you could pay for extra minor league teams out of a list of unassociated teams with varying degrees of quality, and location could affect the players availibility. If say, the Red Sox want Joe Somebody to fill in at first for John Doe for three days while his hangnail heals he cannot get from Alaska to Massachusetts in time for todays game so you have to make do with John Smith who is the backup catcher, at first until Somebody shows up.
