I am attempting to specify "unhide" to subfs so it can be passed to iso9660. 
This is a requirement for copy protection to work for some titles in Cedega.

I started off by adding the unhide option as one would normally do so in
/etc/fstab, which didn't work.

Since HAL purports to support the various mount options through
storage.policy.mount_options.*, I attempted to add the following as
mountpoints.fdi in /usr/share/hal/fdi/95userpolicy as a workaround:

<?xml version="1.0" encoding="ISO-8859-1"?> <!-- -*- SGML -*- -->
<deviceinfo version="0.2">
    <device>
        <!-- optical drives -->
        <match key="block.device" string="/dev/hdc">
          <match key="volume.is_disc" bool="true">
            <merge key="storage.policy.mount_option.unhide" type="bool">true</merge>
          </match>
        </match>
    </device>
</deviceinfo>

This also didn't work.

I did a little digging in 9.3, since the source for 10 isn't yet on the FTP
sites.  From what I can tell, when subfs is enabled, all cdrom mounting is
handled by /etc/hal/device.d/90-block-subfs.hal.  Looking at the source for this
binary, it appears that the options passed to the mount command are hardcoded
depending on the media type.