I think they may be able to satisfy everyone by adding a default movement speed in the options. Those who prefer to move more slower by default could move the slider to the left for a slower more walking pace. I personally had never had the need to move slower (if not crouching). The default movement speed is fine for me and that's maybe why I consider it to be "walking". If I want to move more carefully, I hit the side mouse button (which by default is the C key) to toggle crouch on.