A good cash return from each pistol can be achieved by researching the Gauss Gun under the Heavy category and selecting it as an item on the equipment list. Doing this will allow $50,000 to be obtained per pistol.
During gameplay press CTRL + ALT + '~' (tilde) to access the command console and then type the following case sensitive codes (without the quotes) to enable the corresponding effect. Names of levels can be found within the 'INSTALL FOLDERSYNDICATECONTENTWORLDS' folder.
God Mode: Enter 'cmd(godmode)'
Go to Level (#=Level Name): Enter 'map #'
Level Weapons, Ammo, Dart Upgrade Point: Enter 'cmd(giveall)'