there is a -chapters INTERVAL option with makexml, which I didn't see prior to this. I'm currently burning a disc but when that finishes I'll look at tovid and flip through the options.
The -chapters option is good, but what I meant was nero looks for blackspace and creates a chapter at that point. Which makes sense, a new chapter during scene changes, and there were always 18 chapters (DVD default I believe?) Either way, I can definitely settle with a new chapter every few minutes. Thanks!
edit: this thing really needs a spellcheck.. lol