I don't know whether or not everyone knows how to do this so I'm just going to put the information down anyway:
Go into keyboard config and at about the very bottom you will find an unbound command called pause. Bind to keypad + sign and you can pause the game! Although you won't be able to interact with the player menu.
Go into keyboard config and at about the very bottom you will find an unbound command called pause. Bind to keypad + sign and you can pause the game! Although you won't be able to interact with the player menu.