Yah, just like me.
It doesn't stick on receive.  I found a few very interesting ts-480 
articles.  Appearently MFJ makes an RF sensative switch to do what I want.
A guy wanted to operate his ts-480 from his patio, but didn't like hauling 
out radio power supply, and paddle.  He found out that the cable between the 
control head and radio used 5 of the 6 wires in the cable.  He got a 100 
foot long piece of cable, crimped on connectors at both ends, and used the 
extra 3 wires for jacks from his paddle and to the keying jack on the radio. 
Now all he does is carry the paddle and head out to his patio.  Isn't that a 
nice summer thought?