Hand tool shortcut should be hold button
It would be great if the shortcut key for the Hand tool was a hold button. Like the ALT key and pen tool.
So you hold U to get the hand tool and when you release it, it switches back to the tool that you had chosen before the hand tool was chosen.
You seldom use the hand tool more than navigate around, after which you want to continue do whatever it was that you did before. This is also analogous to how similar hand/pan tools work in e.g. Adobe Illustrator or Microsoft Blend Design.