Currently, it feels like there is some point in front of the camera around which the camera rotates (mouse1). The mode I am missing is more like a first-person mode. The rotation point should be at (or slightly behind) the camera position.
In addition, increasing the step size of 'W-A-S-D' plus a 'sprint/boost' modifier (shift) would make navigating around a bit more fun.
Another idea would be to allow some kind of fluid movement and give the camera some momentum, but that is probably not possible with the current renderer as it seems to refresh the whole scene as soon as the position changes. Nevertheless, in such a scenario the mouse-wheel could be used to set the movement speed.
