Mzo, you really need
this.
I can't play the game with the keyboard, but it plays perfectly with the Dual Shock 2.
Target/control menus with the d-pad, move with the left analog stick, camera with the right analog stick, and the other twelve useable buttons let you control just about everything else.
If you don't want to use a PS2 controller, then at least do this... never use the mouse. Go all keyboard, I hear that works out alright (but you don't get any analog movement of course).
That's more what I was thinking.