Hey,
I have the same problem,
I think it would be very useful,
since for now we can create protocols only until the step where we need track manager
and then we have to do this step manually,
hence you loose the whole point of having a protocole plugin since you need to run for each image at a time the track manager.
Hope this will come out soon,
I'm sure it would be usefull to many of us!
LL