>>391930128
I believe Roomscale is sort of half there, but from what I saw the dev is supposed to to make it fully work in the next update soonish. Manually throwing items doesn't really work yet, you throw them with a trigger, and melee is also mapped to a button while being directed by your head orientation, but aiming with guns is fully decoupled and motion controls are in working order there.

It's definitely in the early phases with some jank, but if everyone already has L4D2 or you can pick it up for a couple bucks on a sale, you should still get some fun out of it with a group. It works with most custom content and mods as well.