As far as I know you can't make an alias that can be passed to mount like an environment variable. You can do the following with alias:
alias mdvdrom='mount /media/dvdrom'
alias udvdrom='umount /media/dvdrom'
In this way you could type:
To mount the dvdrom and type:
When you want to dismount the dvdrom. I'm not so sure there's a lot of time savings in typing either of these commands. I don't really use the mount cdrom much and in fact have noticed that it doesn't work under FC2 any more either. It's just old habits die hard some times and I got use to typing it, when I needed. Hope that answers your question. I know that if you type:
That ejects the cdrom tray and:
eject -t cdrom
Retracts the cdrom tray, so some how it knows the mount point for the drive and mount doesn't.