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There's currently undesirable behaviour if you answer "accept once" for a host key at startup and then leave the connection open for long enough to trigger a rekey: since the host key has only been accepted once, the confirmation message is put up again, which is pretty nasty (especially in the command-line tools). Certainly at the very least we should treat "accept once" on a host key to mean accept for the whole of a session rather than for a single KEX; additionally, we probably ought to think about some sort of sensible behaviour if a different host key to that we originally accepted is used at rekey time, or if the key in the client's cache has changed.