Originally Posted by jasonirma
The only current way to control the angle/pitch of the camera is by selecting a unit and pressing "C" (if your controls are still int he default mode). Once you enter the camera mode, you may use the mouse to move around (and the wheel to pan in and out) to get an angle you like. The disadvantage is that this will not allow you to "bounce" from unit to unit as you would in Battlecam (spacebar) mode.
The UI is not hideable at present.
Not so; you can use combinations of CTRL and the middle mouse button to pan the camera around during normal play (i.e., without locking onto a unit by pressing C). And as ImpElite mentioned, you don't need any mod to hide the UI, just press 'I'!