Hell,
I changed under Einstellungen Theme Pictture from 5 to 8 but theire are only 5 per Line :-(
http://t5net.rafeske.de/t5-net-and-friends-on-spreewaldring-2012/holger-bremen-teil-1/holger-bremen/page/3

You also have to change the CSS since you modified the theme anyway to be wider.