Walk Toggle

[Take One]

This might seem like a strange question, but does the game have a walk key at all? From what I've seen, it's possible with a controller because it's bound to how far you move the thumbstick, but I've been through the key bindings menu several times and didn't find anything to emulate it on a keyboard. I don't mean the sprint key, I mean one to walk slower, just because it gets a bit frustrating having to crouch to move slower or having to follow a certain couple of NPCs who move at a snail's pace and all you can do is run in short bursts and then wait for them to move further.