I was thinking doing something similar in a future pull request, notably to introduce "-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no" so people don't have to handle new known_hosts additions or, worst, warnings that the server's fingerprint changed (which can be quite often if a lot of autoscaling is going on).

I can actually add that to this pull request, early next week at the latest. I was intending to do it in two steps, in case you wouldn't agree with me on this one.