I think that it's already planned, so just a quick reminder:
Convert Scene creates a corona hair material from the C4D hair material but does not assign it. The conversion of the parameters is also bad. And if the current way the hair material works will be kept, a copy of the C4D hair material needs to be kept and be assigned to the object.
Light conversion (as well as Sky) does not work either.
I always work with corona materials and lights only, so a working coverter is a huge timesaver.
