I leave mine in the middle and use fuses =) they react much faster than I can, and they also react if the radio were ever to get a hit or glitch or something. I am flying a cp pro though. I have heard that someone has done the fuse mod for the cx though. That's what I would check out.

The throttle kill you are talking about is called throttle hold, and I am not sure that it is on the cx2 remote or can be enabled with a hack or whatever. If you upgrade to a dx7 then you'll have it. The dx6 is not compatible with the cx2 so you would have to replace the receiver if you went that way.

Hopefull that helps a bit.