Turn off edge scrolling in the options and then use the WASD to scroll instead.
You can use "b" to go into straight overhead view if you're having a hard time clicking on something, although I've always been able to get what I want using the rotation.
From what I've heard, the reason the rotation is not 360 is for fiscal reasons during development. It takes a LOT more money/time to craft a world intended for 360 viewing than it does with a limited perspective.
