The way Lenny makes it sound and the way it should be is that it is user tunable. I would not have a add-on ecu unless I could play with the parameters myself. Kind of like we did back in the day with our mustangs and a program they called tweeker. It allowed everything to be end user adjustable. Much like the megasquirt where you can adjust timing, injector pulse width, so on and so forth. The real problem with modifying a Joyner 1100 is that they use a speed density system, where as a mass air system is more acceptible to mods without adversely effecting performance. Mass air actually measures the incoming air and adjusts where a speed density system measures rpm, air temp, coolant temp, barometric pressure, manifold pressure, and a dew other things and guesses at what to do based on a pre programed code in the ECM. Once you change something like stroke or cam or anything else it then does not really know how much air is coming into motor so therefore it cannot compensate. This is where mass air systems shine and why every major car company has used it since the 90s. No more guessing. Now the engine knows exactly how much air is incoming and can adjust accordingly.
Jarrad