Expanded MLB Roster (40 man rosters)

Even year in the month of September, baseball active rosters can expand from the normal 25 men to 40.  In theory this is a good idea but not in the final month of the season.  Right in time for most teams most important games, teams are brining up kids, they have ten bullpen pitchers and specialists off the bench, not to mention the games take longer to play.  Many people me included don't think you should be able to play all 40 men on a given night, have sort of a taxi squad where the manager would have to designate 25 of the 40 players who are going to be eligible that night.  Teams need more help in April, the first month of the season than September the last month where teams are making playoff runs.