This is specifically for anyone that knows both D6 and Burning Wheel.
Instead of setting a TN and adding up all the d6's, what about a system like that in Burning Wheel? A static target number and each d6 that rolls over is a success, with a certain number of successes being needed to complete the task at hand. I like this premise, because it scales between normal "human" capacities, to more heroic capabilities, and up to god-like capabilities. If you're familiar with Burning Wheel, this makes sense, if not, it is beyond the scope of this post to fully explain the system.
I know there are some variations that are similar to this, but I want to hear from people that are experienced with this sort of house rule.