I think it's part of the game that sometimes big men take those bad decision threes. Usually in basketball starter C-s have more than 1 attempt behind the arc anyway.
Considering you're goto guy tactic. Then I think there should be double-team tactic aswell. How exactly do you plan to implement that? He takes all the shots in the end? Even if he is double-teamed, will the clock run out when he can't get a shot?, will he shoot really bad shots with 2 guys guarding him? If you want him to shoot only when he has a good shot then you're best player usually does that now already.
I would love to win a game letting everyone shoot and just use a double-team tactic on the player he has chosen just one man to shoot.
Basically I agree with you're suggestion of letting people decide from which point you're coach considers the game a blowout etc.
I would like to add that I would not like this game to turn into "choose a tactic for every man for every quarter" type of game.
in this case would better to choose two or three players who shouldn`t try to score from three, cause for example I have two SFs and one of them is for outside tactics and other for inside tactics but then I play outside tactics and then starter SF is substituted so inside player try hard to score from downtown but most of the time I just get nervous looking how he miss shot after shot...
ZyZla - ZyZlūnas ZyZlavotas ~c(=