So I've been thinking of a way to get crits into the RP, and I think I know how.
My idea is that instead of flipping one coin, we should flip 2, 3, or 4 coins (depending on how rare you guys want crits to be). As long as the first coin in the flips is a head, you make a hit, but if all of the coins are heads, you get critted. If this happens, you roll the d100 dice for damage and multiply the number by 3 (as TF2 increases damage to 300% in a critical hit), and as an example for the damage post:
(Heads [CRIT -235 (15)])