I'd like to set who is on the field based on play type as opposed to formation. For instance, I have a FB I drafted last year that is a bruising runner, but his speed is non-existent. I wanted to use him for inside runs in short yardage situations, but when I put him in based on formation, he was only ever used on outside runs for some reason, which became terribly unsuccessful—the opposite of what I wanted.

Also, lets say I have a LT who has a 100 Pass protect, and 0 Run protect. I would use a different LT for most other plays that is more well rounded, but would love to throw this guy in on obvious passing downs.