Click Make the mouse easier to use link. Next, click the Set up Mouse Keys link under ‘Control the mouse with the keyboard’ section. You will see two sliders under the Pointer speed section.

Want to control Mouse speed using CTRL and SHIFT keys? Enable or disable Hold down CTRL to speed up and SHIFT to slow down setting in Windows 11.

Then in-game, when you're setting up your key bindings just hit the mouse button and it will bind an action to N, J, etc.