Exactly. Pitching to the best hitter likely robs Romney of his chance at being the hero...
Seriously though, part of it is on the Red Sox coach in putting together that batting order, creating the "no win" for the Yankees' coach. Yes, I know, there are no guarantees as to how the lineup will turn out, it was partially coincidental that the slugger was up being the winning run with two outs in the bottom of the ninth. BUT, in an "everyone bats" league, somehow the slugger and Romney were still up in that position...[edit: was apparently typing this while Ken was putting his .02 in]
Further, let's say they do pitch to the slugger. Anything less than a home run puts Romney at the plate. So then what...? Do you pitch to strike Romney out? Go "easy?" The Sox coach created a bunch of opportunities to be able to "cry foul."
As far as the age goes, if they are at the level where they actually have playoffs and a championship, if they are rescinding "courtesy rules" for the playoffs (like the 4 run per inning limit that was lifted for the championships), then they are at a level when they are playing to win. If it's a completely "for fun" league, you don't do playoffs.
As Darin said, they treated Romney like a regular player...
Just some devil's advocacy to munch on...