It looks as though you know Kopete quite well - are you part of the development team? Many months ago I was told that the hopelessly outdated UserBase pages for Kopete should be left for now, as the Kopete website was going to be updated, and UserBase should wait for that. If you are able to update all the Kopete pages it would be a great help.
Actually I just lost my configuration, and since I didn't remember how to configure GTalk with it I decided to write it down at UserBase so next time I could look here. I don't use Kopete a lot, so I would not be the guy to write general documentation about it. But anything I find about Kopete I'll write it down here so it can help others :)
KDE UserBase Wiki 