Originally Posted by Doug Cronkhite

Throttle Channel - Yes, absolutely. You don't lose the PWM channel outputs.
For trim, 0 is neutral trim. +/- is simply each side of neutral.
By Trim for flight modes, do you mean so that individual trims are stored for each flight mode? If not, can you clarify what you're trying to do?
Servo speed is exactly what it sounds like. Delay refers to the setting having a delay from the time you activate the flight mode, to when the surface moves. So you could set your servo speed to 50%, which would slow it down, and set the delay to 0-10 seconds. So let's say you have your "normal" flight mode with a given elevator throw, but you switch to "land" mode, which has a different amount of elevator travel. Delay adds basically a transition time between those flight modes, so you don't get some crazy jump when switch modes.
Servo travel, expo, etc. can be setup as individual values based upon switch position.. As in you have a switch that changes elevator rates only, or you can group them in flight modes to change multiple settings via a single switch. It took me awhile to wrap my head about the programming logic here as well, and I've been flying JR for over 20 years.

While I'm in Afghanistan until Dec.. Feel free to contact me with any 28X programming questions you need help with.. I'll do my best to resolve them, or point you to someone who can..