I use a homebrew rule set. Mostly it's a holdover from an old Electric Football league here in Ohio, the MidOhio EFL with some modifications to prevent myself from skewing the results. I use a play caller I made in excell. I usually will opt for passing sticks, but with this large of a league I don't want to have to tweak every receiver for perfect straightness, so I might use a mixture.
I attached an old copy of Mid Ohio rules and my excell play caller to this post...
LEAGUE RULES.doc
Postalo Play Caller.xls