Funny you should mention, we actually had the camera move with mouse position right out of the box using the built-in controller, but compared to the gamepad, the speed was WAY too fast. Didn't have time to properly calibrate it, so an executive decision was made to just normalize the value with arrows same as used by the joystick. Your point about the E key is well taken, though. Ideally, we'd have had key rebinding, but that feature still eludes us, though it's something we're aware of and working on. Glad you liked it otherwise.