Of all of the features in mIRC, you had to pick on this one :-) I usually don't remember who requested which of the thousands of features I've added to mIRC. This particular feature was requested by Tim Berners-Lee and I'm a little hesitant to remove it without an extended, ponderous meditation on the meaning of life, the universe, and everything. It's been quite a few years since the request and I'm not sure if they're still using mIRC for W3C online meetings and in particular whether he still finds this feature, or even mIRC, useful himself.

This feature is turned off by default, so I don't think there's a way to turn it on without the user manually selecting it in the window's system menu. As a precaution, I could pop up a warning dialog when they turn it on that explains what it does, in case they do so by mistake. Would that help?