Re: can we have we all work together this time and have one
If you do end up combining all cards/codes into a single wad I would take Riiak's advice and change all of the all of the prefixes on both file names and functions. At least the combined wad should be made in a way that does not overwrite any of the individual, published wads. That way if there is a modder fixes/changes a card in an individual wad the individual wad would take precedence over the composite wad (provided the user has them both installed). There will still be compatibility issues. It may be at a minimum but I'm not sure.
In my opinion, the best approach to having single location for all cards would be to keep an up to date wiki page/forum topic. The wiki page or forum topic could have downloads for all mods and have a complete card listing of everything available including the request thread (of course with the appropriate link of where to get the card). This way if someone wanted to find a certain card they could go to this page, search for it and see where they had to go to download it. I know people are looking for a single file for all available cards but I don't think this is feasible in DotP for the many reasons people have already posted. This is probably the next best approach though it also has it's limitations. As someone has said before, it is hard enough to get people to use the wiki. Even I don't do it but then, I don't think my wads are significant contribution compared to the current community.
These are just my opinions. Of course you can do as you will.
In my opinion, the best approach to having single location for all cards would be to keep an up to date wiki page/forum topic. The wiki page or forum topic could have downloads for all mods and have a complete card listing of everything available including the request thread (of course with the appropriate link of where to get the card). This way if someone wanted to find a certain card they could go to this page, search for it and see where they had to go to download it. I know people are looking for a single file for all available cards but I don't think this is feasible in DotP for the many reasons people have already posted. This is probably the next best approach though it also has it's limitations. As someone has said before, it is hard enough to get people to use the wiki. Even I don't do it but then, I don't think my wads are significant contribution compared to the current community.
These are just my opinions. Of course you can do as you will.