I just found about this bootmanager WWBMU:
http://lab1.de/Central/Software/System-Tools/WWBMU/

From my little German knowledge, and with the help of Babelfish, I gathered enough to understand that it enables the possibility of switching systems via hardware.

This looks to me as a very promising approach to multiboot.

Is any member fluent in German willing to translate the page and/or contact the author to see if it is possible to have an English version?

Thanks in advance,

Jaclaz