ORIGINAL: wind junkie
I DO like the idea of programmable servos vise the matchbox, but I don't think varying TX pulses explains why every servo shouldn't be able to be mechanically set to a prescribed "zero" position. A TX "center" position with no sub trim offset should give a pulse width of 1.5 mSec going to the servo. I think that was Russian's point was this : theoretically, if you put two servos on a y-harness, they should both be able to be centered exactly the same mechanically (90 degrees to their arms, or whatever measure you like, but BOTH servos should position the same in this way without doing anything special -- correct me if I'm wrong, russian).
As you mention the TX should transmit a control pulse at neutral of 1.5mS, seems they rarely do. It would be advantageous in some circumstance to offer all servos centered and end-point matched. BUT if you're taking full advantage of the programmer and servos theres no point as you'll match them to the specific TX and model application.