libguestfs-mount currently has an implicit dependency on libfuse. It might be appropriate to have an explicit dependency on "fuse", which would make the fusermount command available as well as the "fuse" group. That in turn would allow non root uesrs to use libguestfs-mount.
Thanks, I've fixed the deps in Rawhide now: http://pkgs.fedoraproject.org/gitweb/?p=libguestfs.git;a=commitdiff;h=890195b52f73e26944b876214164069a77a847b9