There are function tables in the PCM; functions of rotational speed of the cam sensor peg and milliseconds of peg duration, on and off. These aren't accessible with our SCT software, but I marked them while digging for some other parameters with a CarDAQ unit a while back. If I went back into it, I could write a set of values for each half degree of advance or retard that was desired, and make the values from +10 to -10 degrees available as hex values files insertable into an Xcal2 .mtf file for anyone using custom tuning.

These tables would need to be changed dynamically depending upon engine speed by adding or subtracting milliseconds of inferred duration of the peg both on and off, but I don't think it would be all that hard to do.