You'd have to modify supermounts source to not only
mount a cd-rom media but also look for a given file/
file-contents to achieve that. On "normal" distro's
(such without that silly auto-mounting feature, that is ;})
there's no way ... you'd have a to write a daemon yourself
that queries the state of the CD-ROM drive (disk/no disk)
and then trigger appropriate action.
On second thought: someone might have been silly
enough, go search on
http://freshmeat.net or
http://sourceforge.net
Cheers,
Tink