If you are not going to throw essentially, get no power throw. So your wpf will not suffer from the penalty, and it will reduce the upkeep. I am not sure though what determines the break chance. Effective wpf or base wpf? You gotta check.
I hope you will be successful and can have fun. Becoming an engineer in crpg is harder than being a dagger cavalry or horseback thrower. My advice would be having a high STR buddy to be your bodyguard. Someone you can play with always and can talk via skype.
Edit: I would be that buddy if I was not going to become a Horse Archer. Engineers need love.