I've now logged some 400 seasons of Football-o-Saurus. Some observations and suggestions.
1) I notice a flaw in the scheduling. While I always play each team exactly once per season, the other teams do not. This can lead to a situation where some teams receive more (or less) favorable schedules than others. For example, in my most-recent season, the schedule was as follow (my team is the Raptors

Game 1
Morning Fire vs The Mammoths
Raptors vs Jurassic Steel
Anvil Power vs Red Volcano
Game 2
Morning Fire vs Anvil Power
Raptors vs The Mammoths
Red Volcano vs Jurassic Steel
Game 3
Morning Fire vs The Mammoths
Raptors vs Anvil Power
Red Volcano vs Jurassic Steel
Game 4
Morning Fire vs Anvil Power
Raptors vs Red Volcano
The Mammoths vs Jurassic Steel
Game 5
Morning Fire vs Raptors
Anvil Power vs Red Volcano
The Mammoths vs Jurassic Steel
The colors indicate duplicate matches. (IE. The two red matches feature the same opponents, same for the two orange ones, etc). In fact, every match but the ones involving my team is colored!
By having teams swap opponents in just THREE cases, this imbalanced schedule can be completely corrected, and everyone will play everyone else exactly once.
Game 3: Have Morning Fire play Red Volcano instead (and therefore The Mammoths will play Jurassic Steel).
Game 4: Have Morning Fire play Jurassic Steel instead (and therefore The Mammoths will play Anvil Power).
Game 5: Have Anvil Power play Jurassic Steel instead (and therefore The Mammoths will play Red Volcano).
Seems like a simple enough change, no? I'm hoping you'll consider this.
2) How about the ability to make seasons longer? Five game seasons are ok, but for variety I'd like to play longer seasons. Perhaps a 16 game season, where if you are in Division 1 you play everyone else in Division 1 twice, and all the teams in Division 2 once. You still have a high level of difficulty, but more variety.
3) Adjustable game length. I am pretty sure when I had the demo version the length of the game was adjustable. But now that I have the purchased version all my games are stuck at 3 minutes in length. I'm not sure why this option was removed (if it was)....but the odd 5 minute or even 10 minute game might be sort of fun.
I hope you'll consider all these options.
And on a completely different topic....for those of you who have never tried it, turn OFF the "Automatically move to lose ball" option. Having it on is a good way to learn the game, but with it off you can perform much more complex maneouvers (such as jumping in front of an opponent to intercept the ball without getting tackled, or backing off so that you don't get tackled). The game is MUCH improved with this option off, though it may take you a little while to learn how to catch.