It does increase the chance of fumbling compared to the standard BRP roll, but otherwise works nicely. I'm not big on extra die rolls and can do the math easier that rolling another die, so I wouldn't use it, but I can see where others would.
Harnmaster, which is a BRP derivative, has crits, successes, failures, and fumbles. You roll % against skill. Under is a success, over is a failure. Any multiple of 5 is a critical (if under) or a fumble (if over).
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