No, it's not a "Jerry Rig" method of doing it. It's a fine tune method. The stock pilot hole is fine for a bone stock car, but once incoming and outgoing air characteristics change, the need for more air sometimes arises. Trying to control it with just the idle screw tends to be finicky and erratic as far as trying to get that "little bit more" without going overboard or that little bit less with the risk of the throttle blade sticking. The idea behind the enlargement of the hole is to allow just a hair more air in, w/o having to increase idle speed or alter TPS position too much.
I just couldn’t remember the recommended size that was used. I guess I’ll just pull out the numbered drill bit set and take it one step at a time.
