Add ability to hide mouse cursor instantly when in fullscreen

I would really like to use this application but it is missing some key elements that I am looking for in an image viewer.
If you go into
Preferences - Fullscreen - Mouse Cursor
The "Period of inactivity (seconds):" drop down allows you to choose "0" which I thought would make the cursor not show up at all, but then realized that it is actually an "off" setting for the feature, prevents mouse cursor from being hidden.

Suggesting to add ability to have a mode where mouse cursor is not shown at all when entering/in fullscreen mode.

Many approaches to achieve this in the Preferences\

POSSIBLE SOLUTION
If do not want to change the look of Preferences can just make a -1 value in the drop down to turn off the mouse cursor.

POSSIBLE SOLUTION
I think for more clarity, I would do something like the following.
-Make showing the mouse cursor when in FS mode be the default.
-Remove the description "The mouse cursor can be automaticall hidden..."
-Replace it with an on/off check box with label "Hide mouse cursor when window is fullscreen"
-Under this on/off check box can keep the "Period of inactivity" drop down
-When check box is "off" the "Period of inactivity" drop down is grayed out
-When check box is "on" the seconds value is applied to the mouse cursor being hidden
-Then would change the "0" value = automatically hiding the mouse cursor in full screen mode.

Hopefully this helps
Thank You