I am not married to the Penalty Sliders, and am in the lab to address OFFSIDES, CLIPPING, DEF PI, OFF PI, and ROUGHING KICKER and KICK RETURNER....
Regarding GameFlow, honestly, not sure if you need them or any other type of house rule such as "no hot routes", "no curls", no outside runs, yada, yada, yada... I have played them with and without GameFlow and either direction you go, they make you work... Below average teams make more mistakes that you can capitalize on, but when you face an elite team, and your team does not have the personnel to match up, look out...
Keep us posted...
Keep playin'! Keep postin'! Keep Maddening!
the Gospel of Madden has spoken.