While I like the idea on the surface, however I would much rather have a slider set that doesn't tie into player rating directly.

A Few Examples:

QB Sliders

Drop Back Speed
Play-Action Effectiveness
Throwing Power/Speed
Release Speed
Short Pass Accuracy
Short Pass Touch/Speed
Intermediate Pass Accuracy
Intermediate Pass Touch/Speed
Deep Pass Accuracy
Deep Pass Touch/Speed

Obviously they would go through and do this for each position, however by having more control over the way the game plays via sliders we'd be able to fine tune things instead of gloabally changing rating but then having a 90 THA QB throwing with 90 THA short, medium and deep which is where we run into problems.

Even better than having one slider for each of those items would be a MIN and MAX for each of those items, therefore a 99 rated player would play to the MAX whereas the lowest rated would perform to the MIN. For example, on short pass accuracy you set the MAX to 85 and the MIN to 60 - a 99 THA rated QB would complete short passes at or near a 85% level where as the QB with the lowest rated THA would complete short passes at or near a 60% level (these are only examples) then every other QB would layer in between 60% and 85% depending on their rating. This would give us greater control over how the game plays in comparison to your model.