An NFSv4 ACL editor
Yes. The idea is to use a user-level NFSv4 client that implements enough of the NFS protocol to read and write NFSv4 ACLs.
A while back I wrote such a beast and it is available at:
It has been ported to Solaris and Linux.
The user interface isn't as nice as I'd like, nor does it support Kerberos V5 authentication. But rather than wait for such things to get done in my "ample spare time", I think it is worthwhile to make it more widely know this software exists. Feedback welcome. If this proves popular, I'll find time to add requested features and bug fixes.