Yep it's a bit janky for sure. I think the Boneworks movement scheme would be great with Half Life. It actually feels a lot like a Valve game, what with the sort-of Portalesque environments.
Especially since Alyx has such great physics, it would be ideal. It's possible my height wasn't calibrated properly which made it odd.
Anyway when you first exit the station in Lone Echo and you're out in the asteroid belt, that feeling of being on the edge of space was just phenomenal.