So I have a few suggestions for scheme modifiers that I think would be cool to have.
No Friendly Fire: You cannot hurt hedgehogs of your clan directly. (But fall damage still counts)
Shallow Water: Every time a hedgehog drowns the water rises.
Stamina Mode: Your turn doesn't end if your hedgehog gets hurt. (Unless it kills him)
Light Mode: Hedgehogs are lighter than normal.
Heavy Mode: Hedgehogs are heavier than normal.
Active Hogs: All hedgehogs move (teleported) to a new spot every round.
Traitorism: Once hedgehogs die, they a revived with 50% of the starting initial health and joins the weakest team, but it cannot come back to it's original team unless it dies again, if that team is the weakest. (If all teams are equal it chooses a random team)