Eclipse PA5532

Hi,
I don't have an owners manual for my amp and would like to know if I'm ok hooking up 4- 4 ohm speakers to the front outputs.......4 -4 ohm speakers to the rear outputs and 1- 4ohm subwoofer plus a set of 4ohm Bass Shakers under the seats. everything will see a 2ohm load and it should totally crank right! I guess what my question is ..can I put a 2ohm load on the subwoofer output and well as the front and rears with this amplifier?

Also I want to be able to control the intensity of the bass shakers so what would be a way to wire in a volume knob on the dash for them or am I just adding more resistance on the line?
I can just go to radio shack and buy a potentimeter for that?

Thanks a lot for your time and have a Happy joyous Thanksgiving!
Dino