We should unify it in a system not using the forum.
I would be willing to make it myself, as I have some experience with PHP
I would make a page where you upload a ZIP (and only a ZIP, not RAR) and assign it a version number.
We'd also have to unify the file structure.
Then I'd make a program in VB6 that
-queries the server using your login information to see that you're registered.
-queries the server for version numbers of installed plugins. And downloads/unzips the new version.
I would need FTP access, or some other way to upload files.
As well as access (the user/pass for reading) to the user registration database.
I think this board is PHPBB3-based, meaning I already know how to access the cookie data to see who is logged in.