I would love the option to toggle mouse look on (the way movement works while in combat) So that I can control with wasd and turn and look with my mouse without having to hold down the mouse button.
But only as an option, there are times I want my mouse free while I am moving.
Have you tried the other camera modes? Press the Home key to cycle through them. I don't recall if any do what you want but I'm thinking Direct Camera mode does.
edit:I guess not. You still have to hold down a mouse button.