Why would you be able to disable it then? Are there people out there that WANT to start in a messed up configuration?
Personally I'd very much like to turn that off, or at least tune it down, for Civ4.
I'm usually playing with 34 civs on an XXL map (150% of huge). Since there are 33 AI civs on the map, it's perfectly okay if some of them get an uneven starting position. Actually I regard that as a good thing because it adds to the variety between games.
Also, the additional resources make early rushes far too effective. Whoever is the first to capture an enemy capital, will usually have a huge advantage because he gets another almost-perfect location. Or, in other words: There are 34 city locations on the map which are game-breakingly good compared to the others - thus, 95% of the whole map gets devaluated in comparison to these artificially boosted starting locations.
This also removes a lot of strategic thinking on part of the human player. As long as you can establish a reasonable amount of culture there, going for the enemy capital in a war is often the best choice anyway. The fact that you already know beforehand that the capital will have a very good selection of resources often makes this decision a no-brainer.
Finally, for the players how like the feeling of simulating an alternative human history, the fact that 34 locations in the world are artificially boosted doesn't sound very immersive at all.