Looking for some help off you wiring wizards out there

Have all the tamyia wired to the dx7 and it works just fine, but heres the prob :-
When you turn the hand set off, the tank/sound system will not shut down..has to be done from the on/off switch. Now some will say whats wrong with that...well you are then getting the cold start sound only all the time, not the fast hot start sound.
The on off main switch am going to use a micro servo to switch on/off (gear channel)..
Now am guess that the 2nd hot start sound will not come in because of spektrum's model match system they use..
Does any one know a way round this?