Following an excellent suggestion by Ben I have added the option to allow the users to adjust the number of location decks in a game.
In the global tab of release 22.214.171.124 you will now see a “house rules: extra locations” counter above the decks. If you want 1 more location than normal, set the counter to 1 to make it a bit harder, if you want 2 more, set it to 2 etc. You can also make the game easier by setting this to a negative number. In all cases there must be a minimum of 1 and a maximum of 8 location decks!