I think you realized that there is no need to use two channels since this device drives two servos from one channel and basically give you about a 100 point throttle curve for each servo independant of each other. This lets you setup the servos where the engine are very close without synchronization. Then when you turn on the sync function it drives both servos so the engines are in sync.

The way I have it programmed right now is that the syncro function turns off below 1/5 throttle and passes control back to the transmitter. The initial set up lets you increment or decrement each servo to fine tune all of the settings below (and above) 1/5 throttle. The only thing you have to program is the idle point of each engine in the event of an engine failure. I will probably add a few more programmable things if I take this to market.

Another feature is that it watches for errors in the PPM stream and if three errors in a row happens it performs a PCM lock out type function and reduces both engines to either kill or idle. I have worked with this piece of code a lot and it offers PCM lockout functionality with a much quicker recovery time on a standard FM radio. I personally fly all FM receivers because of the long time PCM lock out typically lasts (except for my turbine which has to have PCM).

Keep ideas and questions coming and let me know the interest level since if I release take this to production the initial cost (to me) is fairly expensive.