Mdun - it would be an interesting study, what the effect of playing say +4 vs -4 in defensive positioning. Most vets would tell you rebounding would change, and 3pt's attempted would change. I also think most nearly all would tell you fg%'s would change, both on 3's and 2's.
What I think might be the case, and the answer to your ?, I think shot clock's go quicker vs +4, and I think TO's go up - this is a guess, as I said, and to restate this would be a nice study to make - the effects of +4 vs -4 on all box score results, not just reb or shots. I have two teams playing abnormally bad right now, and a 3rd team with my alias, that has 9 new players, maybe I will try to study this in more detail.