Hey, I'll research this, but in the meantime you can do something like this:
Let's say you're building a yoke and when powering it you need it to startup in the correct calibration. Now, let's say the simplest the position to startup is the fully forward one (for a stick it would be centered).
Then what you would do is to push it fully forward, reset the motors and check what the "raw" angle is. Adjust the belt/pulley so it's roughly 2000(+-500).
Next do the full auto calibration and store it.
After that, before powering on, move the yoke fully forward and it should start in the correct calibration every time.