Yeah taking over timing would be nice and it is a shame that it isn't there - but mapping TPS makes it much more drivable IMHO. Smooth transitions to and from any desired level of driving.
I am not even sure why someone would want to convert MAF to MAP on a piggyback - if I were at that point I would replace not augment the ECU. What is the point of totally overriding fuel, boost and timing via a piggy back - replace the whole thing at that point and get anti-lag also.
Just thought it was interesting that it can be done in Xede and wanted to discuss it further. Now that I go back to UTEC documents - I am not real sure why this function hasn't already been released on it as well.