Mike,

Everyone has their favorite setup and you'll get varying strong opinions regarding battery/switch/regulator requirements. Personally I use a single 5 cell nicad battery, no regulator, and HD JR charge switches on all of my planes. I have never had a switch or battery pack go bad in flight. The HD switch has dual sets of contacts and the JR servos you are planning to use work fine without a regulator. I also cycle my battery packs regularly and replace them when they drop to 70-75% of rated capacity.

Anytime you add components in series reliability decreases; conversely when you add redundant components in parallel reliability improves. I recommend that you not use matchboxes on any critical flight surfaces. If a regulator goes bad (unless you have two in parallel) or if a matchbox fails you will be in trouble. You have 9 channels, why not use them all? Only one channel should be required for the turbine. Put the ailerons and flaps on separate channels. Use a matchbox to link steering to rudder.

I don't believe they are necessary but if you are dead set on using two batteries each should have its own switch, then each to separate receiver inputs. If you are dead set on using a regulator then you should have two, one in each battery/switch circuit.

Joe