What is missing to create a follow me car add-on?

It surprises me that there is not yet a follow-me car addon, payware or
freeware. I suspect it is not possible with the current SDK/SimConnect. Is
that true, and if so, what is missing?

Actual we have something about that in internal testing but for AI. The major
issue is that airport data might be encrypted (no readable BGL) so there is no
way to read any airport information. And on the other hand I have the feeling
the AI is sometimes using stange paths to get from A to B… What we need,
would be a fully readyble Airport Information incl. taxipoints and paths and
maybe the algorith the Sim ATC uses to determin the path.