The hypothetical script we are talking about should clearly be disallowed for the single reason that extending an IRC client to automatically open all links that start with
http://game.planetarion is trivial. In python, you'd say
Code:
import webbrowser
if link.startswith("http://game.planetarion"): webbrowser.open(link)
Assuming that there is a variable called link. This is here only for illustration.
It is trivial to make clients like x-chat, irssi and mIRC automatically open links, which actually gives you a botnet. Admittedly only for two hours at a time, but I don't think it should be very hard to come up with a way to get around this.