I guess the title says it all. I was looking for a way to e.g. hold down a modifier key and "grab" the storyboard so that I can stop trying to aim for the scrollbars every time I want to scroll freely with a mouse.
I found this key chart http://cocoasamurai.blogspot.se/2011/03/xcode-4-keyboard-shortcuts-now.html but it didn't help.
Best Answer
Smart Scroll will help you here. Though it has many features, one of it is grab and scroll, which is exactly what you need.