So thanks to moder "Banned" I just found out that:

ActorREF.GetAnimationVariableInt("iState") == 63 ;--- means they are in water

Anyone know any more IState number meanings?

Guh. Seriously? It's that easy?

Anyone know how to test these? I suppose you could write a short loop to ping it to trace / notification periodically when running / jumping / crouching / blocking / etc.

And by "in water", you mean "they are swimming"?

Probably "they are swimming". Banned may know a lot more as it was in his script (one he posted).

I can't replicate this. I get an iState of 0 mostly all the time, except for when I'm sprinting or sneaking. I get sneaking = 2 and sprinting = 1. We of course already have player.IsSneaking() and IsSprinting() for those.