captainsolo said:

You leave it as Dolby 2.0 and either in information or metadata can detail as 2.0 mono. This is how it is done on commercial DVDs that I've seen, the box and menus will list mono but the technical specs are just Dolby 2.0 ac3.

Do you know if the DVD standard allows for metadata in which one can specify 2.0 mono, so that a player could opt to display that information when that audio track is selected? That's what I'm looking for in DVD-Lab Pro2... I just don't even know if it's worth searching for (if it's not part of the standard, there's no point in my continuing to search in DVD-Lab for it).

Regardless, it looks like I'm going to stick with the 2.0 mono I've been using. Thanks for all the great feedback everyone.