Scoring tweaks should be high penalties for INTs, Fumbles, and all turnovers in general not to water down the offense by down grading the TD stat. If you are worried about QBs being god-like then make their yardage stat 100 yards for 1 point and add negative sack penalty. And to make the RBs even with the WRs have the yards gained on different weight systems.
QBs 100 yards passing = 1 point
WR = 30 yards reception = 1 point
RB = 50 yards reception = 1 point
RB = 30 yards rushing = 1 point
INTs = -3
Fumble = -3
Sack = -2