just to clarify from experience:
1) you CANNOT use just any AV cable (such as a camera cable) except the apple ipod AV cable. something about the signal and the way the ipod software setting pushes it along to the TV. i'm sure that there will be some others that work (like the monster) which are either built for this purpose, or are just configured the right way. unless you are trying to spite apple for some personal vindication, i suggest just going with it since it works and you won't buy 7 different useless cords in the process.
2) jed is absolutely correct on this one. running on the AV Cable idea, if only the specified cable works, chances are slim-to-none that converting this signal from S-Video to RCA is going to be successful.
in short, while there are often easier, even cheaper, ways to do things differently to how apple advocates in their instructions, this is one instance where sticking to the outlined method is best - infact, it's the only way. purpose built hardware demands purpose built accessories...
hope this helps...