To change their class, you can either use the Save Game Editor, or change their .utc file.
You can get the Save Game Editor here...
http://www.starwarsknights.com/tools.php
You would want to edit the classpowergain.2da file to change how many Force Powers your character gets per level, depending on their class. I have a mod that changes all this for both KOTOR games.
KOTOR
http://www.pcgamemods.com/mod/8322.html
TSL
http://www.pcgamemods.com/mod/11091.html
To change the feat gain per level, you'll want to change the featgain.2da file. There is a mod by Darth Moeller that can help I believe for KOTOR.
http://www.pcgamemods.com/mod/13839.html
And Joris made one for TSL
http://www.pcgamemods.com/mod/12188.html
Hope that helps.
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