2 key maps active for 2 keyboards at the same time

I have added one of the blue tooth keyboards to my MBP. Currently I can select one key map that is active for the internal and external key board. I would like to have one key map for the MBPs internal keyboard and a different key map for the external blue tooth keyboard. My searches have turned up nothing so far. Any ideas on if this can be down under Snow Leopard?

Regards,

Bobby