I think DVD RAM support is hardware related. So no, if your current drive doesnt support dvd-ram, I don't think you can just install software to enable support.
I think the only solution would be to buy a DVD RAM capable drive.
But hopefully some one more knowledgeable in the subject can chime in
PS: what drive do you have? are you sure your drive doesn't support DVD-RAM? I think most modern buners support it, (but to be honest I dont know, as I have never used it).