This is what I found in my first attempt at using it.
Down, Distance and Location of the field are great. Custom location and distance to go was an excellent idea. Quarter was a bit of a problem because I wanted a game-long rule for every down, so I had to add each quarter and OT and each down individually. An "all game" option would be nice.
Time I found a bit confusing at first, but I figured it was time remaining in the quarter, and if I chose 15:00 - 0:00 and every quarter, that would amount to a game-long rule (right?). Score I wasn't sure if it was symmetrical: is it there a difference between "down by 3 to up by 3" and "up to 3 to down by 3". I expect not, but I thought I'd ask.
Finally, I would have preferred the defaults for play and formation be 0 instead of 100. The rules I wanted are about very specific things I wanted done (rather than things I wanted to avoid), which means I had to turn down almost every bar instead of simply raising the bar I wanted.
Something funny happened with the Decisions section as well. When I edited a 4th down rule, all the bars were different. I think they were taken from my general gameplan options? If so, I think that's great, actually, it's something I was going to request, but I would have liked to know to expect it. I can't remember if that happened because I decided not to edit the defaults after all because it seemed like too much work, or if it changed the bars I set (I think I did drop some bars to zero).
Two-point rules seem too complex to build at this point, but fortunately that's something the game handles pretty well. I'd love a "Save as" button so we can create an additional rule starting from the template of an existing rule. That would be very nice and it would help streamline difficult rules like two-point situations.
Overall, an exciting addition to the league, good job!.