I just read in the install instructions for opensuse on MacBook Pro that you can have only our partitions. How can that be? Is opensuse that different from Ubuntu? I am successfully running Ubuntu 9.04 as a dual boot with Mac OS on an iMac 7.1, with 2 Mac partitions (including EFI) and 4 Ubuntu partitions, root, swap, tmp and home, and it works perfectly well with grub legacy (it will also boot from the MacBook Pro, but Ubuntu does not seem to run so well on the mbp for other reasons, hence my interest in opensuse). So the same layout ought to work for suse as well, right? Also I should like to know if I am going to be force-fed grub2 if I switch to suse (grub2 is not well supported by the Mack's BIOS emulation).

Only thing I can think of is they are using the new ext4 file system and grub will not be able to read them at start. Other then that I cant think of why you wouldn't be allowed to use other Linux partitions.