There should be a button for stopping any current action. Just pressing "P" for example, and you stop any action, reloading, moving items, equipping items, reading.
I don't really care what the key customizations are as long as I can change them, this specifically goes for the mouse. My ideal setup for PZ would be. Left Mouse Button: Single Click on Floor - Moves AvatarSingle Click on Enemy - Does nothingSingle Click on Object performs 'E' actionClick and Hold on Object performs 'Hold E' actionShift + Left Mouse Button: Same as mouse but the avatar does not move when clicking on the floor. This prevents moving on accident Right Mouse Button: Click and Hold on Enemy - Charges/Aims weapon - Hit/Fire on LMBSingle Click on Object opens context menu