Almost all of the electronic ignitions on the market today use very close to the same program curve and it is in relation to the RPM. Idle needs to be in the 7 degree BTC range otherwise the idle is really rough. Full advance on the model engines needs to be 28-30 degrees. Anything outside of this brings in to many other issues and the power gain is just not worth it.
Back in the TOC days I worked with an ignition that would pull back to TC at idle trying to get the downline speed slowed down but the engine would start to backfire and sounded really bad, breaking was good.
The YS fires every revolution since the magnet pickup is in the rotor disk, the current draw could be cut in half if it did not do this but battery consumption is so low its not an issue. The ignition is powered by the flight pack battery.

I dont think I said 600 RPM idle, it does idle at 1400 very well.

Bill