Right now, holding down either the left or right mouse button while moving the mouse will simply change the camera angle when using the legacy camera option. Spell casters have to make sure they are facing their intended target in order to get a spell off, and I have no way of turning my character with legacy camera.

My suggestion is to add an option for the legacy camera that, when selected, allows the user to change which direction his character is facing to match the changing angle of the camera while holding down the right mouse button and moving the mouse, similar to the default camera mode's right mouse button.