So, I was thinking on it some more, and at the risk of sounding boastful, I've realized the loose nature of it has some neat advantages:
The roll made by the referee (hereafter called the Difficulty Roll) can be modified based on objective and subjective bases.
- Objective would be a flat modifier based on the determined difficulty. Obviously, characters with higher relevant stats will be better at this tasks.
- Subjective would be modified by a percentage of the character's relevant stat. This represents the fact that certain things are difficult no matter how much raw ability you have. It levels the field, so to speak, without totally disregarding raw ability.
I had thought of more, but they escape me right now. I'll build on this as more ideas come to me. I think this idea has a fair bit of potential. I was also thinking it needs a clever name, so I came up with R.A.R.E. Ridiculous Acronym (for a) Resolution Engine. Just kidding.