Hi,
sure. WASD controls are explained in my wiki (http://www.indygoof.net/wiki/index.php/TopDown_Toolkit), the shoots would be just an implementation of a new skill (like the Firebolt).
Even if you would choose to not use the Basic Skillsystem in the Toolkit, you could still use the camera (zooming, rotation, etc), the enemy AI (with 3 different types of player sensing, player searching, roaming, melee and ranged combat, aggro range, etc).
Of course, if you got any questions, you can always drop me a mail.
Cheers,