Here's how you do it: Add a superflex slot to your league's lineup. Listed as an "OP" (offensive player) in ESPN leagues, the superflex slot can be filled by a QB, RB, WR or TE. Your League, Your Rules Create a league and customize league size, scoring and rules to play in the league you want to play in. In superflex leagues, however, both QBs were lineup mainstays for the near-entirety of the season. And in a superflex league, it's imperative to examine all 32 teams' quarterback pictures, right there alongside examining every team's third-string running back and No.