You can scroll down to see, for example, a list of values returned by the List function or ExecuteSQL. You an only see 3 rows at a time, but you can see them all if you click into the result pane and drag down with the mouse.
And I agree that more flexibility here would be an valuable new feature: http://www.filemaker.com/company/contact/feature_request.html
Yeah, but I want to see them all at once in a window. I went ahead and submitted a request.