Hmmm...what kind of DVD-RAM is it? I have a Panasonic (well, Matsushita) LF-D101 SCSI that works in OS 8.6 and up. I have a LF-D111 IDE that works in OS 9 and up.
DVD Tune-up will write to DVD-RAM in Classic, and I have Toast 5 that will as well, but I haven't used it.
I have to say, I have just started using DVD-RAM, and I love it! I am way too disorganized to save everything up to burn all at 4Gig once, and I have found that while I can write multiple sessions, not every drive can recognize more than one session.