Frankly EA just seems like that they gave up on this one so that I doubt anything serious will get changed, but maybe they're taking a look at pushing a great deal of great features for the next gen version? I'd hope that's true, otherwise M20 is probably the last one I will play for the foreseeable future.
The slider has to do with sheds and shit. It is the exact same in 20. There is no slider which affects sheds handling the run or pass. It is just pass blocking and run blocking strength which we may tune. Too low, you always get by.