I think there is some merit to this providing a little more safety help than they have on certain downs and distances...I also think the front 7 needs to get much better at getting their hands up for pass blocking and operate a 3rd man through system for screens. LSU did very very well at getting their hands up last week and it made a huge difference. If we are dedicating this many defensive players to the backfield then they need to get their hands up every single play.
Front 7 should have a count in their head every game. If they haven't broken through their block to get to the QB before say a 6 count (<+/- 2.5 seconds average college QB time to throw) their hands go up, then use that break to work a secondary move towards the quarterback. If the TE releases to your side or you are on the trips WR side of the formation you should have fewer blockers and get through faster but this is also a vulnerable short passing situation with a LB covering against the Slot/TE, then its say a 4 count to protect the slant/stick/drag routes to your side.
Coaching staff could get a GA to calc the opposing QB time to release from film depending on down and distance and adjust base number for the line each week and tweak during the game. While it may not always cause a pass block. If the line is getting their hands up on every passing play it will force additional progressions by the opposing QB and possibly help other pass rushers complete the sack or hurt the QB's accuracy and touch.
For screen defense, on any play if you're the 3rd man through the line your hands should immediately go up and you shade towards the side of the QB that your blocker went as you broke through, the QB the going to try to throw before you get there anyways because your teammates are pressuring him. Also if you break the line way too easily and the RB evades and does not pass protect you should chip hit him hard. He will always pass protect or at least chip you on his way out on a missed block by the lineman if he's not the primary or main secondary release receiver. If the ball is not in the air you can crush him pre throw behind the L.O.S.with no consequence, getting him off his route or to the ground.