A step further on.
With your help my primary mission is accomplished - getting access to the global AF-adjustment.
I thought I actually would need this because one specific lens was pretty much out of focus.
But I had made a big mistake. I did the focussing tests under artificial light conditions.
I should have done this under daylight conditions. This lens can easily be corrected via the usual menu.
Next mission: Removing two annoying restrictions. Enable remotely triggered bracketing and time-lapse shooting.
That's the major challenge - hopeless I fear.
@richandfleur
AFAIK this work has been started with the release of the K10D.
This
Debug mode could be a usefull source to answer your question.