anyway to make an option that forces a player. (unless i'm missing it?)

i.e. say i want lebron in my line ups. well he's not an optimal player he won't see a lot of line ups. i could raise his projections but i would need to keep toying with it to hit the # i want.

my suggestion is this, if i make 100 line ups and i want to "force" him in 20, i would like an option that says "force: 20%" or something of sorts. that way no matter what his projections are, the 20 best line ups will pop out with him.