Hmmm. I'm trying to think of how that could possibly work. The DX3.0 has only one button for channel 3 that works as an On/Off switch or as a held button. It can also be used to send signal from the steering channel (I think, assuming I recall correctly) to the third channel.

If it were possible to have different servos connected that respond to different parts of the channel feed, you may be able to use the servo mixing option for channel 3 to control different servos. I'm just not sure how that would be done.

When you do find the thread I'd be curious how they did it. I could actually use that ability myself for a project I'm working on. (I was presently intending to use my DX6i, but if I could use a proper RC Car remote, that'd be better for control reasons)

And thank you for the kind Welcome.