For those of you out there who don't like the thief class (I'm not among you, but here you go), why not just (A) drop thief as a class and (B) give all of the thief's abilities to the fighter? In addition to the old chestnut problem (oh noes! thieves are teh weaksauce and goes against my filosofy!), it also makes some headway toward mitigating the linear warrior / quadratic spell-caster problem.
And that way, every fighter gets to be Conan, which is pretty much exactly what you diehard OSR folks want out of D&D to begin with, ain't it?