Not to be an assjockey, but there are reasons why I planned on this sort of thing - I kept 4 QBs, a FB (not required at all), and generally 1-2 extra players at every position. Why field 11 offensive linemen when only 7 are required? Yep, only 7 are required. And it's easier to switch a DT to OL than it is to find some guy who can be swapped in as a QB!
I'm not going to bend the rules a hair, once my team is too injured/retired to compete, I'm done.