Most aluminum alloy and composite bat manufacturers recommend against using their bats in a batting cage if the cage uses the yellow dimpled pitching machine balls. If it uses regular balls then it isn't a huge problem. You will just be wasting some of the pop in the bat. It is best to buy a wood bat to use for batting practice. It keeps your game bat fresh and it teaches you to hit the ball on the sweet spot.
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Yes you can use them until the spring season of 2012, then you must use BBCOR certified bats. (Right now they are BESR certified)
Only some composite bats are approved. i.e. the combat b4 and the demarini cf4. Go tothe related link for more bats.