Nope, yoiu don't have to be afraid, S-Video and ADB cables are exactly the same. I've used S-Video cables as ADB, and vice versa many times before, without a problem.

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Nope. Well, not for me anyways. A few months ago I got a few s-video cables to use just for ADB cables on macs, and every single one caused the mac to boot when I plugged it in; it must have been shorting out the power on pin and ground. And this is not the only occurrence, I've looked around on other sites and forums and seen it happen to other people; so no, do not trust every s-video cable to work interchangeably with an ADB cable.