I don't post in bugs, 'cause I remember that this has already been discussed on xs.com sometimes ago.
In my board the general configuration is "25 posts per page".
My personal one is "50 posts per page", others have 30... and so on...
Well, in the list of threads I see any 3d with more than 25 posts divided into 2 or more pages...
Even here on xs.eu the 3d "Save Forum.php To Disk " is divided into 2 pages, but has only 20 replies...