While in game play press Backspace, then type one of the codes below in the dialogue window. 

Function - Code

     Full health1 - give me life 
     Play as Queen Amidala - iamqueen 
     Play as Qui-Gon Jin - iamquigon 
     Play as Obi-Wan - iamobi 
     Play as Panaka - iampanaka 
     Wide screen view - beyond cinema 
     View credits - gurshick