It is tragic. However, the only way we will get Carrara support for PFHOE, (which lets face it is the best budget solution for Motion Traking), is to tell PFHOE that you want Carrara support.
Email them here:
hoeinfo@thepixelfarm.co.uk
(Unless you are a programmer and able to convert PFHOE xml format into either .car, .syncar (syntheyes) or .rzml (RealViz XML).)