I still haven't had a chance to try the mod yet, but I just wanted to weigh in on the issue of including the HD Mod as an official "Ad-on" pack of Ur-Quan Masters.
I think it would be nice to have it as an ad-on pack, but I don't think the team making the HD Mod should be responsible for making it suitable for that purpose. Let the core team take their source and "cleanse" it so that it meets their criteria, and then put it as an optional download on the installer.
That way the HD Mod team can keep working on whatever adjustments and fun extra stuff they want, and there won't be any arguments over what is or isn't necessary to include in the "official HD Mod" and no one will get their feelings hurt.
Plus, it's a little brazen for anyone to be saying, "Hey you guys should take out all this stuff you did so it can become an official download option."