Perhaps.

Why is this unstickied?
Have you stoped working on it or is it just cause it isn't finished?

Its not finished, and it might not be finished for a while.

How would CD know that it isn't "that kind of hack" :P

Hacking through CD is easy evilspy; you just have to load before it. ^~

I could see using this for warcraft mod if it modifies the hud, but is it possible to make it OPTIONAL, I wouldn't want to use it if ALL of the clients had to have it installed

If its optional, then how would it work? The server would request a function and...never receive a response.

Umm instead of making the functions affect everyone globaly why not just loop through each player and target them indivisualy to see if they have the add on, and if not allow a forwarded function that tells the plugin that the client does not have it and let the author decide what to do from there. ^^

It doesn't effect people globally. If you use a function, IE, it will send a message to the client to interact with cl_metamod, it either has to succeed, meaning the client will have to have cl_metamod, or the function will fail.

exactly :) And if there is no response then we assume they don't have it installed :P :P

Or i can check for a client cvar to see if it exists