Just to throw support to Coredump... he is exactly correct. You cannot use the feats (Rapid, etc) per hand and if you are using blasters you can only auto/multi-fire with your primary hand (well... that should be with ONE hand... it doesn't matter which it is as you can choose which hand is your primary and off each round so to speak).
I may be wrong but I think you could Rapid Shot AND multi-fire in the same round, but all penalties will stack. I didn't look it up but one is a feat and the other is the blaster itself. Might be feasible.
What the heck does "IDHMBIFOM" mean?!
That is one I don't know afaik. 
I may be wrong but I think you could Rapid Shot AND multi-fire in the same round, but all penalties will stack. I didn't look it up but one is a feat and the other is the blaster itself. Might be feasible.
What the heck does "IDHMBIFOM" mean?!

