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WE LOVE YOU JAILBREAK!!!
Half-Life 1 was huge on modding as well, but game developers still haven't made their games as easily mod-able as Valve games. Not to say they don't, it's just Valve supports it so much more. They biggest selling games are mods (Counter-Strike, Day of Defeat, Team Fortress, etc.)
That's just mapping, though. You can do that for any mod and it's still a map. It's not like a Sven Co-op map where your weapons get changed and the environment's different and such. Like Megamonsterwhateve (I forgot it's name) in Sven Co-op changes your weapons and enemy models. That could be considered a mod, but it isn't because it follows the Sven Co-op theme of anything goes as long as it's co-op. The Dead Before Dawn maps just add more to the mod. It doesn't change L4D, it just adds to it. A map should be innovative, otherwise, why play it? In HL1, the Crossfire nuke should constitute it as a mod then if it's to follow the same guideline as Dead Before Dawn being a mod.
Gun Game is a mod because it changes CStrike. Complete model packs for weapons are mods because they change everything or a significant amount. If a bunch of maps are to be a mod, then it really needs to distinguish itself from the other maps of the game it's "modding". Otherwise, every map should be a mod because it changes the original game by adding something different with new layouts, etc.. L4D is based on scenarios and that's what Dead Before Dawn does. It could be a good bunch of maps, but that's all it is, a bunch of maps.
However, if it launched outside of L4D, then I'd see it as a mod because it would then be a separate entity.
Jailbreak v.2 FOR THE WIN!!!!
The mod's looking great! I really enjoyed MS:C, so keep up the good work!
Tim Burton would be happy.
Duke Nukem Forever better be ******* awesome, then