I haven't been pursuing this matter with the attention it deserves, but I have known that several programmable, addressable mapped ignitions were being developed in various places -- usually for specific applications.
Now I learn that one such now available is a black box advance unit for Motoplat, created by people at Motoplat Great Britain (I haven't their address yet.). Motoplat, I find, are the European equivalent of our Sun Engine Analyzer people.
They were amazed to find that the most effective ignition curve for the Honda 125 single has two peaks. And why not? This engine has no exhaust gate, so its torque is determined by fixed pipe geometry. This imposes multiple torque peaks (you can usually see only two - the others are too low down the rev scale for the engine to pull the dyno), which arise from all the occasions when positive waves return to the exhaust port just before closure.
In the case of the Honda, high advance will be associated with poor cylinder filling, which equates to low flame speed, so each "flat spot" will correspond with an advance peak, while each torque peak will be an advance minimum.
This black box can be programmed from a laptop computer -- either freehand (good luck) or point-by-point on the dyno.
In the past, inquiries after such ignitions in the US most easily reveal NASCAR-like apparatus, of overnight-case size, which provides only a ramp up, plateau, and retard slope down. This may be close for flat-torque V8s, but is nowhere for engines dependent upon wave action in a big way, as motorcycle two-strokes are. There is no reason for suitcase size, for existing ignitions such as the one on current TZ Yamahas are small enough. If programmable ignitions had to be as big as those NASCAR things, how big would a Silicon Graphics workstation have to be?