Ok lets say your cdrom is linked by a file called:
cdrom
Save a file like this in your /username/Desktop
folder, name it
cdrom
change the parameters you want
[Desktop Entry]
Dev=/dev/cdrom
FSType=iso9660
Icon=cdrom_mount
MountPoint=/mnt/cdrom
ReadOnly=true
Type=FSDevice
UnmountIcon=cdrom_unmount
X-KDE-Dynamic-Device=true