First and foremost: GREAT WORK!
You seem to already be able to detect whether or not a CD is inserted.
Why not add the option to eject it? This means people who don't even
dual boot will may rEFIt useful, and can increase the exposure/popularity
of rEFIt. People are always complaining about having CDs stuck in their
Macs and needing to wait for the OS to boot just to eject it.
Of course, this is really a fringe feature request, not at all related to the
main goal of rEFIt, but maybe it's really easy to do,