Is there a way to make actors stumble? I tried using PushActorAway() but with even a value as small as 0.1 they all just flop to the ground like fish. I'd love it if they would stumble as though the player had sprinted in to them, it would look a lot better.

Is there a way to achieve this?

You'll have to http://www.creationkit.com/SendAnimationEvent_-_Debug I'm thinking. A stagger animation might be suitable, although there might be better ways to make that happen.