This page will describe my hacks to the new 'auto switching' receiver for the 5v line of 2.4ghz transmitters.

I am very happy to say that these new receivers appear to have both a 'carrier present' line and an RSSI voltage available for our manipulation.  Here is the inside of the receiver and the two pins identified:


 

For those who might be curious, here is a shot of the unopened unit to give you a sense of how small it is: