A very good place where to start is from the xrootd Savannah page at CERN:

http://savannah.cern.ch/projects/xrootd


The historical place where to discuss, propose things etc. is the xrootd mailing list, hosted at SLAC:

xrootd_l@slac.stanford.edu




... or you may contact furano_at_cern_dot_ch