The top 2 numeric up down controls are for the width and height of the imaging frame (F). This is used to draw some little alignment corners the right size to aid aligning the reticule up on the capture frame. These alignment corners are now independent of the window size. Remember, if you are capturing a 1280x960 camera at 50%, the frame size will be 640x480.
The next 2 numeric up down controls are for the X and Y Offset (O) from centre of the frame.
The 3rd pair of numeric up down controls are for the Slit(S) dimensions, or slit width and height.
Then the reticule rotation (R) controls, Luminance (L) control and finally the centre circle radius (r) if you want a circle.