not to say its impossible... but I do know the rear window has its own computer (so to speak) that rolls down just that window when activated by the remote. the only way I can think of doing a full window roll down/up would be to tap into that and run additional wires to all windows. now thats assuming all the windows wont take too much draw (Im sure they will when all are activated at once) then you have to figure out how to run the relay power out to all windows on the roll up feature (rear window hack) from the tr7.
to me the best option would be to go with an aftermarket alarm system. too much headache to do it all and it would make a bigger headache if it didn't go right or messed up later down the road.