Scoreboard demos

Heya!

I was wondering about the Scoreboards - there's been a few 'Demo' options on there for a while now, but I was wondering how they work. The European Pony demo for example only shows 54 european ponies, I'm pretty sure there's more than that on the whole site, I was wondering what that particular demo is filtering for?

And will there ever be an option to filter site-wide scoreboards ourselves?