rsync - Jul 2014 - Transfering extended attributes in the "system" namespace

Dear all,

nfs4-ACLs are exposed to userspace as an extended attribute 
"system.nfs4_acl" in Linux.

I need to copy these ACLs from one NFS-Server to another. I have found 
that in xattrs.c rsync filters all extended attributes from the 
namespace "system" and does not transfer them.

Question 1: Is it reasonably save to patch rsync and transfer them 
anyways? I have tried it, it works. :-)

Question 2: If is is reasonable and save, is there interest in a patch 
to create a option to not ignore the "system" namespace?

Regards,
Philipp