As for disabling it completely, I think you'd either have to modify the editbasic.tmpl or showprofile.tmpl file and remove the lines for the chat services.
The only one I noticed, that can be hidden, is the ICQ entry during registration, but as you know it can be changed once they log in and change their profile.
Editing the above mentioned files is something I can't access nor do I think the owner would want to mess with. What do you think.. there are so many options with this new version.. couldn't/shouldn't it be easily hidden (as an option) via the Control Panel? Just a suggestion.
