Probably the best way to dual your 6V regulated setup is to dual everything regulator switch and all ---------- I would tell you from my experience with my MIG you could dual it out with just a 4.8 pack and switch. The thing I'm not sure of is what effect that would have on your regulator??

My MIG is setup with one 4.8v 3000ma pack and a Duralite 6v 2400ma pack. The two differing voltages you would think might conflict. I've heard some say the 4.8 is going to draw down the 6v pack. Well so far all I've seen is voltage to spare ----- I have an I4C digital voltmeter mounted on-board and after several flights with both packs turned on, I haven't seen the voltage drop below 5.0 volts! All the while charging the ECU battery between each flight! ECU batteries need to be pumped up each flight I beleive!!
With the Jet Cat it is said don't make more than three flights before recharging the ECU pack, cause if it drops below 7.0v even during a voltage spike the turbine will shutdown. I haven't ever seen that happen, but I have witnessed a bad ECU battery that was so weak, during ramp up when the fuel pump was asking for more voltage the thing would shutdown and never complete the start sequence. I discovered what was going on because I like to watch the voltages and he happened to have an I4C in the same circuit as the ECU battery. I noticed the voltage drop quickly to 7v when the turbine was trying to ramp up! We changed out the bad ECU battery with a new one and "vola" the Jet Cat was back to it's old self again --------- started and ran like a clock!!
Lee ----------