Open the file SWAT4/Content/System/swat4.ini and go down to the section "[Engine.GameEngine]".
Change "EnableDevTools=False" to "EnableDevTools=True".
Now, during the gameplay, just type the [~] Tilde button and the command console will appear and type these in.
behindview 1 3rd person view
behindview 0 Back to 1s person view
SetGravity X Changes gravity to X (Replace X with number desired)
God God mode
SetJump X Changes how high you jump to X (Replace X with number desired)
Ghost No clipping mode
Walk Turns Ghost off
open mapname Load map, where mapname might be
Entry
MP-ABomb
MP-ArmsDeal
MP-AutoGarage
MP-Casino
MP-Courthouse
MP-DNA
MP-FairfaxResidence
MP-Foodwall
MP-Hospital
MP-MeatBarn
MP-PowerPlant
MP-RedLibrary
MP-Tenement
MP-Training
SP-ABomb
SP-ArmsDeal
SP-AutoGarage
SP-Casino
SP-ConvenienceStore
SP-DNA
SP-FairFaxResidence
SP-FoodWall
SP-Hospital
SP-Hotel
SP-JewelryHeist
SP-RedLibrary
SP-Tenement
SP-Training
swat_splashscene