What does this Controls Hold Cursor Toggle option do ?

In Options - Controls you'll see (as shown below) an option to "Hold Cursor Toggle" .
Could someone please explain what this does exactly.
An example as to when/why you'd use it would also be greatly appreciated...



Thanks in advance for any assistance you can offer.
Frost

 

When enabled, you are in "reticle" mode and moving your mouse turns the camera without use of the right mouse button.

 

What's reticle mode?

 

It's where you don't have a cursor, just a targeting reticle. Like holding down the right mouse button for mouse-look but without actually holding down the right mouse button.

 

First person view?

 

Whatever point of view you're using.

 

ahh - requires restart once it is enabled.