Jahydin
Hero
That's the best part though!By not having a "roll-under" system reminiscent of THAC0 with positive modifiers used to subtract from a DC - which is set based on what your favored ability checks are - and again modified by a Challenge Rating. (I guess that's how it works - I'm actually too confused by it now to adequately explain it.)
You just described how to tweak it to make it the perfect system for you. Someone else will think that's not the way to do it and tweak it completely differently.
C&C is the perfect toolbox to play the best version of AD&D possible, with a tiny bit of work.
But seriously, your explanation is pretty darn close to what I've done in the past:
One number to roll over (I call it "To Hit Challenge Class 0" (THCC0)) for each attribute.
Start at 16. Prime gives +3, Non-Prime -3. Modified by Attribute Bonus of course. Then lower it by one for every other level.
Makes skill checks lighting fast and bakes in Save progression just like AD&D.
Now I've gotten to like the extra layer Challenge Levels offer though, especially when comparing Levels and HD to determine how hard Saves are.