The built-in screens will only scroll if their content won't fit on the screen. Are you saying 10 tables fit but you've got more tables configured?
As for automatic scrolling, it's either on or it's off. And it only scrolls if it can scroll. That is, if the content is taller than the screen. You can't configure it to only scroll if the content is too tall AND some other condition (you have more than 10 tables).