i dont see why you would need any extra holes, the stock system works just fine, as long as its working ive never heard of the motor blowing cause the water was not getting out of there fast enough
Pumping water threw the engine faster isn't a good thing. The system is set up, and regulated to run at the proper temp. If you want to move the pee-hole so you can see it easier... that is OK... but you don't wan to add more exits.