I believe he was talking about the XP counter under "Total XP" with clan's. It shows all XP since last joining the clan, which is great I suppose, but then you'd have to pull up to 12 pages..
The problem though, how do you determine which clan a person is in? Even with adventurer logs you can't find out, you just get a flag. Solve that problem and I think you have a good way to solve the no-f2p-highscores issue.