For me, #6 "can" make a big difference. I get (got) most of my big to-the-house runs around the end. They come on either options (North Carolina runs a lot of option for me, but Michigan doesn't) or outside handoffs (not pitches, as those are about a 5 yard loss for me about 90% of the time
) or counters when there is no receiver on the side to which I'm running and the D is playing man. If I can get no defenders on that side of the field, I'll motion a TE to the side I'm running which'll usually cause the LBs to shift a over little, but they don't bring any new defenders over there. Then when I run the play, the blockers (a lot of times I have a pulling lineman or 2) block the DL and LBs and then my extra blocker (whom I motioned over there) can pick off the safety who comes to help and then there's noone between my RB and the goal line.
Obviously this doesn't happen every time (maybe 10% of the time), but I figure 1/10 runs going for 50+ yards is just a "bit" excessive. Before I stopped motioning my TE if I broke one of these runs more than once in a game my RB would "trip" as I "accidentally" pushed the dive button, but that got stoopid very soon. I've only played about 5 or 6 games with this no-motion-on-runs restriction and so far it's working well (think I've broken 2 long runs around the end in those 5 or 6 games).
The long runs used to be really, REALLY bad when I found out about the impact stick. With that, all I needed was to have only 1 guy to beat and it was a guaranteed TD 75% of the time.