I would set the Time Signature map to reflect your desired time signatures. It's called Meter Window in PT/RB. As Mac mentioned; also any tempo changes that may be required should be in the Tempo Map (Tempo window).
Then select your Realdrums and generate. I've done this many times in RB and PT should handle it much the same.


Make your sound your own!
.. I do not work here, but the benefits are still awesome