JohntheBruin: Well, you can't name that "Handicap Helper" because customer courses do not produce boosts to averages
You're confusing two scenarios, it has nothing to do with the name. As pointed out above, a custom course, one designed by whoever, DOES NOT affect the average.
OTOH, you can set up any combination of conditions on a stock course and IT WILL affect the average. This is typically where "Red Tee" whatevers come from. Clubs will set up stupid easy red tee tournaments and players pound on it to get that average down.
Basically, changing just the conditions-tees, wind, greens-on any of the WGT courses still counts towards your average. :-)