Yeah, I've definitely searched for it. It's been addressed for the homepage and the watch page, and the link that you gave talks about the channel page (where all the channels and their thumbs are listed). But what I need is to change the amount of videos in the channel details page, where the newest and most watched videos are listed for any given channel.
My feeling is that it's not possible, but I could be wrong.
Anyone else have any idea? Admin?