Well, the problem with my previous idea (Dreamcatcher as an add-on to Inferno) is that I'd be assuming that they would already have Inferno. If they didn't, they'd be required to download one of the larger mods out there in addition to the campaign itself. This is one of the major complaints I got when I put up that mission a while back, before some mod was kind enough to move the thread to Inferno's board where it would be more well-received.
Besides, when INF SCP is released, I'd have to rework Dreamcatcher in order to keep it up-to-date and pretty-looking, and if it was ported out, I wouldn't have to.
Besides all that: I feel almost like I'm intruding on the Inferno team's idea by having it in Inferno. I didn't exactly ask anyone's permission or anything to have it in Inferno's universe. Maybe I don't have to, maybe I do, I don't know, but the fact remains that I didn't.