[Ifeffit] Other programs than FEFF - GNXAS and MXAN

I heard a talk by Ziyu Wu of Beijing Synchrotron Radiation Facility in which he said that the international community prefers a package called GNAXS to FEFF for EXAFS calculations. He also has his own package called MXAN for XANES fitting. What do other people think of these programs? Would it be possible/worthwhile to modify Athena/IFEFFIT to use one of these other programs? I haven't investigated them, so I don't know whether it would be possible to put a shell around GNAXS which would make it look like FEFF and therefore be usable directly by IFEFFIT. mam