Torey Lybrand did score 6 goals for Westside on 2-3 different occasions. After the first time, she was limited to first half scoring and could only get assists in the 2nd.
There were numerous occasions, however, as W&E has explained with Caitlin Robinson, where Westside won close matches, 4-3, 3-2, etc. and Lybrand scored all of her team's goals. In these situations (a match decided by one or two goals), I think you let your scorer do her thing.
But I know firsthand from experiencing such a situation, strong player-weak team-some really weak opponents, that other coaches are careful to point out who she is scoring against and how many goals she is allowed to net against weaker competition. Thus, in the end, a coach has to keep himself honest (usually it is his doing, not the players) and make sure the "goals by one player against a weak opponent" is kept to a reasonable level.
It's not easy to reign in your thoroughbred when she's lighting up the back of the net against East Creampuff High, but building a better TEAM is the end goal of the coach.
What good was having a player who could score a ton of goals against really weak opponents when I faced a quality side? Not much. Look at Westside's 10-0 loss to Wren in 2006 for example. I think the focus for a coach with a team that is becoming competitive should be: increaded athleticism of the players, passing and creating space, and a greater tactical awareness on defense as a team. Those three things, plus a little club thrown in, are what make you more competitive in the end.