Yes, you can add a 2 channel amp. Often times, even in a theater application, a stand alone 2 channel amp does wonders for those front towers. You would use your left and right pre amp outs using an rca cable into the left and right of the amp.
I have a mint Stratocaster that I bought new from MF. Has the 57/62 pickups installed. Comes with all the paperwork, candy, etc. $1250 shipped and paypal'd to your door. Only selling because I picked up a couple amps I need to pay for.
I purchased a new American Professional II Stratocaster knowing I was going to swap out the pickups and wonky wiring push push knob to add the neck pickup in any position. That being said, I bought a brand new, Fender loaded pickguard with the 57/62s and couldn't be happier.
You are 100% correct. I switch out the Focals and the KEFs on occasion.
Nope, you're right again. The MLs do have some very nice low end extension and don't need a sub and surprisingly the Focals have a very nice bass response as well and the KEFs come in third with respect to bass.