I'm afraid I don't understand your idea at all, OP. Can you articulate it clearer? Dice rolls for success or failure are one of the worst mechanics of all time ripped straight from tabletop role-playing stuff with poor pretensions about actually being games. The best solution is to take this shit mechanic and toss in the trash where it has always belonged. Random numbers for damage or whatever are fine, but critical success or failure mechanics should not be decided by dice rolls, period. The whole point of a game is to test one's skill for entertainment and these stupid mechanics have always flied in the face of that.