Since checking inventory, chatting and messing around in menus are all activity it's highly unlikely that an auto-logout will ignore such activity. However controllers with auto-fire triggers, and other 'methods' for running yourself into a wall or whatever are also easily defeated since there is never going to be a 30 minute period in game where a legitimate player is almost literally sitting on the button like that.
Not to mention that the feature will undoubtedly evolve and improve over time, let's see how it works in practice and give constructive feedback from there.