I always think it's dumb to lump "team defenses" and "team special teams" into the same unit. I mean, they're completely separate phases of the game. You might as well just lump team offenses and defenses into a single unit, too. I especially hate leagues that use D/STs and reward return yardage, since the best D/STs are often the worst defenses (because every time they give up a TD, they get free return yardage points). I'm a big fan of rewarding individual players for their individual yardage- and that includes return yardage. Team defenses should only be rewarded for what the DEFENSE does. If Devin Hester has 600 yards receiving and 400 yards in punt returns, he should be more valuable than a WR that only has 750 yards receiving and no returns. If Hester scores 4 TDs on returns and 2 receiving, he should be rewarded more than a guy who scored 4 TDs receiving.