multi boot

hi , i have a bit complicated question.
i have 4 SATA drives on a PC
1) win xp
2) vista
3) OsX 10.5.2 and they all boot from vista (Thank You EasyBCD)
i added the 4th drive with OSX 10.5.1 (I want to do some update experiments with it so that if it gives problem i have the original 10.5.2 safe on the 3rd drive)
ok i can boot it independently but i cant add to the vista boot so that i can boot 4 operating systems by easy bcd ,tried all ways but did not work. can anyone help me please . thank you
At the moment there isn't any way to boot into more than one OS X partition without modifying or hacking the Darwin bootloader to show them both.