Returning to this idea again, have used the playlist option on multiple DVDs since this thread and no one's said anything, so guessing they've worked.

Am now considering a project which follows more of the Seamless Branching Multi-Angle mentioned by DVD-BOY. The DVD format is a fall back position, but as there are all these other formats/containers gaining popularity, looking to understand if any of them should be considered. MP4 and MKV or AVCHD?

The idea is to have two audio and two video streams, randomly chosen, but swappable on the fly. Hoping that two streams of upconverted LD rip (720x576) to 1280x544ish will fit in the bit rate space of a DVD9. or whatever format can be figured out.