It supports MBR, GPT, and APM:
(sorry for the gmail-style top posting; i can't find your mail in my mbox for whatever reason)
Any other partition schemes ought be trivial to add; they've not been added yet
simply because I don't have means with which to test them.
Looking at the "partition types" section of the Linux configuration, I see:
Acorn, AIX, Alpha, Amiga, Atari, Macintosh, MSDOS, BSD, Minix, Solaris x86, Unixware,
Windows LDM, SGI, Ultrix, Sun, Karma, EFI/GPT, and SYSV68.
Looking at the disk-label code from partman, I see:
gpt, msdos, amiga, atari, mac, sun
So the only ones covered by partman and not covered by growlight would be: amiga, atari, sun,
and mac (if mac is not the same as APM). I don't see any difficulty in adding these four, so long
as there's someone with an Amiga or ATARI who'd be willing to test them out. If there are no such
people, is it that important?