RE: DX-6 Switches
1), just change the location on the cp remote. It's in the wrong place relative to all the other heli remotes out there =) Just open it up and the collar that is around the outside is like a screw, undo that and push it through, then swap the trainer switch with the idle up switch
2) Throttle hold is the one that cuts your motor's power and puts it into auto rotation =) that is on almost every remote except the esky on the right hand side, and the idle up is on the left. Eflite has it backwards =)
3) see above
4) the trainer switch is for a buddy box so that someone can either each you how to fly, or you can teach someone else how to fly without a real big risk of loosing the heli to crash and without having to pass the box back and forth.
5) there probably are, but I think the cp is responsive enough without dual rates =)