buddhagamer explained this in another thread a while back, I think he was tracking it. The thought was that it is just based on % of 3FGA; but that those parameters don't line up inversely, which is why it's possible to see teams that are bad in one and only neutral in the other. It doesn't really make a lot of sense, but that category has always been a prime one in my mind to make more intelligent. In both cases, efficiency should at least play a part in the preference. A team getting lots of guard scoring, but only attempting 25% of it's total FGs from beyond the arc should be more attractive than a team launching half its shots from down town and only hitting 30% of them.
Also - Paint scoring *should* be based on points in the paint, which the game notes in the box scores, but unfortunately doesn't track over a season apparently.
An efficient, balanced team should be attractive to both players who want paint scoring and perimeter scoring, and it's absurd that it's not possible.