Biological Censor?

Not quite.It is logically possible that there is no continuous series of viable genomes leading from one type of organism to another, and that the lack of these paths is what causes the limit between micro- and macro- evolution. So although a Finch can evolve to have different size beaks, there's no functional intermediary between a reptile and a bird (which is in essence what Behe and co. are arguing through irreducible complexity).They're wrong, of course. But, in principle, the idea is not logical invalid just empirically false.

Usually, but not always. There are examples of single-gene mutations in humans that are fatal, or cripling (I'm afraid examples allude me at this time; I can seek them out if you wish). What I'm suggesting is that it is logically possible that every 'kind' (whatever grouping that may be) is genetically isolated from every other kind in this manner.

Oh, absolutely! Many lines of evidence demonstrate that.My point is not that such things exist (they don't, as can be demonstrated) but that proving NS and RM is not quite enough to demonstrate full blown evolution.