In Pause mode type in:

 hardtruckisthebest     Money and license
 wininalottery          Money and license
 openallroads           All roads open
 advancedmap            Hidden containers marked on map
 freerepair             Press [Backspace] for free repairs
 freerecover            Press [Ctrl] [ [5] for free recovery
 fillup                 Unlimited fuel
 minesoff               No mines
 turbine                Plus keys [Ctrl][1] for forward thrust
                        Plus keys [Ctrl][2] for backward thrust
                        Plus keys [Ctrl][3] for upward thrust
                        Plus keys [Ctrl][4] for downward thrust