FlySky GT3B 2.4ghz radio system

I have the real cheap and nasty 2 chanenel FlySky radio and the same 3 channel as in this thread but from Hobbyking. Seems to work fine but I found a very odd issue with it. It can actually control multiple Rx's at once. Yep, thats right. I had three receiver on the bench, each with a battery and one servo plugged in and they were all moving in unison. Crazy stuff. So if you finish playing with one of your cars and change over to another but forget to switch the first one off they will both move together. Try it and see. It's pretty funny.

Also one thing that is very well documented is the fact that Exponential setting on these radios do nothing. I have tried and it just does nothing.