[reBane]

The way MotdMenu works is by pumping the menu items into a database for a packed to render into the Motd. Clicking a link or closing the menu goes back through the backend and, from there, rcons into the server with some client information, invoking the correct menu callbacks.
You wont be able to make actions happen from a Motd unless you use rcon.

Spoiler

You could probably bypass the need to copy/dump a menu into a database if you know what to render, and maybe the motd browser supports enough javascript to use a front-end rcon implementation. But then again, you dont want the rcon password in front end-code because people can steal it that way.