Just one note as Devil's Advocate...
If there is a designer, are the ID folk claiming that the Designer only stepped in and designed a few critters or sub-systems? If that is the case, is there some reason that the Designer only stepped in to design some pretty much irrelevant and unimportant subsystem such as the bacterial flagellum?
They aren't claiming what the limits (or exact number of products) of the designer are at all. The argument they are making is that if they can show even one small detail for which evolutionary mechanisms are not possible, some sort of creation mechanism must be responsible. If it exists in one place, then it could just as easily have occurred many places, but we would not be able to tell due to reproductive realities. That is we couldn't say for sure if it was one vs the other.
Does that make sense?
So to them they are simply looking for the single card they can pull which will topple the whole house of cards. After one instance is recognized, they don't really need any more to have a valid theory. Every other aspect becomes suspect.
The rest of your questions I've seen answered, but never well, so I hope an IDer takes the challenge.
Edited by Silent H, : clarification
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"Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing." - Robert E. Howard
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