Definitely. Great idea.
It actually helps with the training because you have more control over what the coach does.
There is one problem though. From what I understand, the real goal this isn't necessarily (only) to protect your starters -- it is also trying to make the game a bit more newbie friendly, and protect brand new teams from getting beat by 80 points.
I agree that there are games in which one would like that the blowout rule didn't kick in, but that might defeat its original purpose.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."