You can use the same console cheats that were used in the original NeverWinter Nights

First, you will need to hit the tilde (~) key and type in "DebugMode 1" (case sensitive). Then hit the ~ key again and press TAB. This should show you a list of the different functions available. Hit TAB again to scroll down the list.

Cheats: (case sensitive)(X is a number)
SetCHA X - Sets your Charisma
SetSTR X - Sets your Strength
SetINT X - Sets your Intelligence
SetWIS X - Sets your Wisdom
SetCON X - Sets your Constitution
dm_givegold X - Gives the X amount of gold to you
GetLevel X - Raises you an additional X amount of levels
dm_god - Makes you invulneralble (does not require you to click on the player character)
dm_heal - Full health
GiveXP # - Give # amount of experience points

On some of the cheats, it will simply give you a message saying "success" after you enter the code and press ENTER. Other ones, such as the SetCHA will say "Entered Target Mode". You must click on your character to enable the changes on your character.
-from Jason

Unlock all HOTU expansion chapters in single player
In the neverwinter nights directory there is a file called nwnplayer.ini Open the file and find the line that says "CODEWORD XP2=" or some variation thereof. Change it to:

CODEWORD XP2=barkeater

If there isn't a "CODEWORD XP2=" line then just add it somewhere between the "[Game Options]" and "[Control Options]" lines. After putting this in you should be able to access all the chapters for the expansion campaign
-from Master9000