was wondering if it would be possible to make some sort of server/client patch, were is you add lets say client modifications with in the minecraft.jar. The server could update/replace the current jar the joiner has with the one you have edited for your server?
Spout would be the closest thing to what you're looking for and the easiest to convince users to actually use. If servers could push modifications they could push malicious ones too (eg. grab your passwords or files, and not necessarily just from Minecraft).
hmm, well i was just thinking of something simple, but i guess i know what you mean. Figure it would be easier to distribute your edition with client addon's with out them having to go to your site or put them in yourself. Thanks anyways