You can install Kanotix to the partition instead of the mbr then just edit the Mandrake lilo.conf to boot into that partition as 'other'.
eg: other=/dev/hda1
label="Kanotix"

The Mandrake lilo on the mbr will then boot into the Kanotix lilo on hda1. With Kanotix as the default on this lilo and the delay set to 0 or a very low value, you won't even notice that you are booting through two lilo's.
This is possibly the easiest way to set up a multi-boot system.