Cut without preview option
To enable this option
Go to Blender preferences -> Addons Find in list Half knife Go to Keymaps tab Open Half knife keymap, check Cut without preview option
Now you can do cuts without pressing mouse buttons. When the operator is invoked from an outside of the mesh the preview will still be shown.
Credit
This allows the user to choose if there should be any preview when a cut is started from outside a mesh.
This extension does not require special permissions.
One of my favorite addons, much more handy and faster allows you to cut polygons than the default Blender knife. Quickly fixed the bug after I created an issue on github. Out of wishes - it would be good to add a option in preferences to disable switching the half-knife to the default knife when it is outside the polygons, this often gets in the way, I had to disable it myself through code in python file.