Does anyone know of a way to get multisessions on a bluray disc from DVDA5?

The Advanced Burn Parameters say that multisession is enabled for my burner, but I see no tags to enable it. Also, the burn panel "Do not erase" button is greyed out although the advanced burn parameters shows it recognizes that there is a BD-RE disc.

What I'm trying to do is get multiple individual videos on one disc. If this is possible, I'm also wondering how that would appear on a PS3 in terms of an overall menu to select the different videos. Has anyone done this before?

Thanks,

Dave