I just released a little Ace2 mod to simplify optimized battlegrounds raids management.
It allows specifying a main assists list : the raid leader defines the main assists players, and other players can assist them via a dynamically updated /assist macro, selecting main assists by range, alive and online status.
It also tries to maintain the raid composition after entering the battlegrounds.
This is a beta release, please report bugs here.
http://www.wowinterface.com/download...40-BiGOpt.html
[edit] Renamed to BiGOpt