I know I'm just a newbie around here, but I have some remarks, although I might say stupid things.
1) I agree on a special board pertaining programming.
2) I really like the Community Project idea and I don't know what this ZFGCSDK is. The current one in the forum in the forum I think it was something called 'King of Thieves' or something, I really liked the concept of the bits I read. I don't know if this project is still running or it is dead, but what I do know is that there are way to many topics with way to many replies for a newbie to jump in. This brings me to the biggest problems of Community Projects. The information is scattered and mostly unaccessible. You need something like a Wiki page. Something where a newbie who would like to learn and contribute could quickly get up to date on the latest development in the project. This wiki can contain a GDD, a TODO list, links to the topics in the forums that are currently discussing the parts. Maybe a kind of resource management system for that project. Although making one or two topics sticky because they contain info about the project, it still is not the best to do, because you often loose sight of what is in the project and what isn't due to the many replies. But the disadvantage is that this most likely requires more than just a new layout or forum update.
The second problem with community projects is that there is always someone (or a few) needed who is willing to take the lead and probably the most dedication to the project. If there is no sailor at the helm of a ship, the ship will strand and get nowhere. The same goes for projects. This person will also be the one that makes the final decisions and prevent endless discussions.
3) A ZFGC engine in Gamemaker sounds a nice idea, because it seems to be the most used and people would be able to quickly make their own stories. It seems to tie in with this ZFGCSDK, which I have no knowledge about. I don't know if it is the best to stick with just Game Maker, because some people might want to learn somethings else as well. The same goes for the MC graphics as ZFGC style. I know the website has a resources section, but to me it seems a bit unorganized and cluttered. If ZFGC had tile and spritesets for FS/MC, ALttP and the GB(C) games, people could work together more easier and won't have as much color issues and people could include their custom made graphics in those styles as well. You could also make a section for textures and 3D models and custom made styles. This is an advice, but putting everything in one topic and then end up with a topic with over 20 pages. This is not apealling to go through.
This are my 10 cents of thoughts. I am a newbie and may have said something stupid. My apologies for that.