Fencer: I actually use different positions in my FRCEC tournaments.
While there are some positions that are better for one side than the other, its a matter of luck to get a superior position than another one played by someone else in the tournament.
And since there is no standard opening theory in FRC, for us FRC players, one position isn't any better than another. It's a matter of the luck of the draw.
I would make it an option in your tournaments, same opening for all, or random positions everytime.
Make sure though that its not possible to draw randomly the standard chess opening.