Now I might be completely wrong, but wouldn't it be enough to just change a line in the OMVFilesystemBackendZFS class in OMVStorageZvol.php from <code class="inlineCode">$this->properties = self::PROP_NONE;</code> to <code class="inlineCode">$this->properties = self::PROP_POSIX_ACL;</code>?
This is equal to return true. I just wanted to be sure. But this would enable acl support for zfs in general, but it has to be enabled for each zfs pool/dataset explicitly. This is ok for me, because I know that. Others might not.