oh and back on the original topic, it's not going to lead to premature pump failure unless some of the metal shavings from drilling get into the pump to cause premature wear. The problem with drilling it out is that it reduces and almost eliminates steering feedback at highway speeds.
I've drilled the orifice on ford & toyota pumps to give higher flow for hyrdro assisted steering before. The ford pump whined a bit more but this was needed to allow enough extra flow to give the hydraulic cylinder enough fluid that it wasn't hindering turning if you were turning the wheels fast at a slow engine speed. The yota pump had no problems other than you needed to shim it at the same time and my brother blew up 4 pumps (thank you autozoo for lifetime warranty) until he found one that lasted long enough for him to sell the truck and that one is still running on the truck but only drilled not not shimmed.