I had an idea for an interesting (I think) skill that wouldn't be game breaking. (I'm sure it won't happen just entertaining the notion).
Bull Rush (and I apologize if the name or idea is used somewhere that I just haven't noticed). But basically if you declare a blitz with a player with this ability you can decide to make it a bull rush or not. If not it's just a normal blitz carry on, but if you declare it a bull rush the players MA is increased by, say, 2; but the blitz has a few rules. 1 when the player blocks during the blitz his movement ends (although frenzy still works like normal). Also the player MUST block another player during the blitz, or else they'll fall down where he/she ends his/her movement (being too risky or something) which will cause a turnover and an armor roll. Additionally the player falls down BEFORE any touchdowns are scored or anything (similar to blood lust).
I'd imagine it as a strength skill (Agility or Passing would be silly but general would be a bit much)
Just an idea I figure players like beastmen (although they already have a blitz booster), minotaurs, or beserkers or someone could have it.
Feel free to critique or give ideas you've had for interest rules (either ones that might be appropriate for a single character, one that would be fairly universal and non game breaking etc.)