Why not just distribute that stuff over multiple posts in the same thread, and put a link to a single post in the announcement?
The way I've been organizing the Files thread in my subforum is that the first post contains the latest and greatest files, while all later posts are basically patch notes, giving the changes in each mod since the last version (since versions are incremented simultaneously for all components, at least for now). Since all four mods are modified at the same time, and given that I went through thirty or so "alpha" versions of my Alpha Centauri mod before it was even close to ready for a v1.00 level (suitable for announcement), it just felt more appropriate to split the posts chronologically instead of by mod.
I'd not consider debuging the same as playtesting.
But yeah, not sure if a sticky would work :/.
It probably wouldn't, but I don't think there's really an objective way to separate the smaller mods from the bigger ones. It never makes a modder happy to be told that his work is just not important compared to someone else's, no matter how justified that might be. The only really objective criterion in this whole process is the one you mentioned: whether it's "done" enough to be posted on the front page, and that's not very applicable to this. So it's probably best to just stick with the usual begging for help.
A forum looks easily dead while a topic doesn't. And a dead forum is really crap.
It's sad to hear that the activity dropped so much here.
It's not just a reduction in comments, there's a clear decrease in the number of casual viewers (which isn't always a bad thing, but in the context of advertisement it is); I host my files in my thread, instead of through the in-game browser or the CivFanatics database, and I've tracked download numbers for each version.
When I had a single thread, I'd pretty consistently get ~100 downloads a week for each new version, meaning in the 2-3 weeks between updates I'd get almost 300 downloads. You'd get a burst of ~50 folks in the first day or two, clearly the active forumgoers, but then you'd get a fairly smooth increase after that, implying that a lot of casual players downloaded it during a one-a-month sort of delve into the modding forums.
In my own forum, in 26 days I've had 118 downloads, with about 20 of those coming in the last day since your mention of my mod on the front page (and thanks for that, by the way). Now, maybe the solution is to place the files for the next version into the main CivFanatics database, where people can see it without coming into the forums at all, but to me that falls into the same category as the announcements this thread was about: something that is used when it's ready for prime time (which the Mythology content clearly isn't).
(I could always upload to the in-game browser, I suppose, assuming no one tries to sue me for copyright infringement on the Alpha Centauri content I used. I'm sure it'd greatly increase downloads, but I didn't want to do that until at least the base content is in place for all four components. So maybe next month.)
One way around this problem: In Civ4, most of the mods which have a subforum have in many cases additionally their main thread in the modpacks forum. Keeps the mod more in the focus of the people.
This'd probably be a good idea, but the question would be what should go into that modpack thread, if the content-specific stuff all has its own thread. Or conversely, if everyone starts posting into the modpacks thread again, then what's the point of the separate forum threads? So maybe make a locked, stickied thread for each Project at the top of the Modpacks area, with the text of the thread consisting only of a quick summary and a link to the corresponding Project area.
It might just be me, but I'd prefer if the Projects forums themselves were placed/linked at the top of the Modpacks area, so that any casual mod-user going into the Modpacks area can't help but see them there. (It'd really be best if it could exist in both places simultaneously, but I don't know if the board software can handle that.) The current arrangement, with it placed after the less-used forums like Utility Programs and Map Scripts, separates it a bit too much from the comparable content IMO. People who have been here a while will know where the projects are, but the new folks won't venture far from the Modpacks area.