My /etc/quota.conf (which doesn't appear to be owned by any package, maybe the initscripts cause it to be created?) hasvery weird default permissions: ---x-wx--T 1 root root 7 May 7 19:18 /etc/quota.conf
This is a problem with linuxconf, not quota.
Eeek! s/600/0600/
linuxconf-1.16r1.3-2.src.rpm should fix it and will be in the next RawHide unless it is superceded by an even newer version.