Strange, I was thinking today that there needs to be better organisation of the plugins.
Moreover I feel we need to set some rules, like where they are installed. (I try to make mine install independant) but I think it would be nice to have one directory where all plugins get installed. Obviously they would install in their own folder within in that folder. My highly unoriginal suggestion would be a folder called plugins within the main Road Runner folder.
But some sort standardisation needs to be made.
Now, as to your plugin suggestion, I'm in bit of a quandary, because although I agree it would be a good idea, having a direct download link would be against the way my personal distribution system works. BUt I won't rule myself out though.