List of players in chat?

Is there anyway to get a list of players in chat? I'd like to expand my random clan member buffing to people who are in chat, but haven't found any way to get a list with which to work.

I understand the desire not to have mail or chat functions to keep people from spamming, but was wondering if just a list of players (in chat) would be safe/allowed/doable.

If I remember correctly, the PHP function that gets called by /who is one of the most expensive functions in KoL. As such, I don't think it'd be a good idea to give it to scripts.

Ok, I'll have to see if I can find another way (or something else to work on )

Out of curiosity, expensive in what way?