I am surprised at how many of the things people envy are specific rules. By specific rules, I mean rules that applied in a limited set of scenarios such as a particular class or a particular feat or a particular subset of the game. Why do you feel that these elements could not be ported directly (or at least in spirit) into your preferred game? I get why a fundamental change to the resolution mechanic (i.e. Weapon of the Gods) or even a shift in play methodology (i.e. troupe style play) are challenging to port, but specific rules seem very doable.