I find it quite painstaking that they set the ranger mode as a preorder bonus, to some degree I felt like the ranger mode in Metro was the optimal way to play, and that was free DLC. A new gun? The chances are that gun is considerably more powerful than weapons you can gain by regular gameplay means. So, if you want to cheat, you can either use console commands or preorder the game - your call. Extra money? The game might as well show you the final ending sequence so that you can brag you finished Metro Last Light in a matter of minutes.