Reading the above, there could be an easy solution to help make the run/pass game a bit more even in the current engine. As Two Pint said, there needs to be another calculation to determine interceptions if a pass is off-target. The chance for an interception should be greater for an off-target pass than for an on-target pass. This would severely hamper the passing game for teams with unskilled QB which would make the running game much more important. This probably wouldn't fix all the problems, but it could bring a bit of strategy to the run/pass game.

Since the devs have already made great progress on the new engine and will be rolling it out any day now, they could start on this update shortly after it's release to fix the current engine.