I'm not sure i really get your point, to be honest (that's meant in a positive way).
I suspect the cockroach doesn't 'care' if the situation is 'artificial' or not. There is an environmental threat, it adapts to cope with it. The mechanism we are using to poison cockroaches is analogous to one that has also developed in nature (there are carnivorous plants that use glucose to attract prey).
Are you saying that as it is 'us' poisoning the cockroaches this isn't an evolutionary response? If it isn't - then what is it? (This is the bit i don't get).
We could go on about how we are products of nature, thus what we do to the cockroaches is entirely natural. But that doesn't really get us anywhere at all, so lets not :)
(And this response isn't the development of an extra receptor, it is the firing of an existing one. I don't think this difference actually affects the outcome, but it is worth noting - the development of an extra receptor would actually be a lot more complex, after all).
[EDIT - apologies for all the 'air' quotes]
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