I think that any unusual bid must be fit-showing In my partnership I play 3♠ = Good raise. At least one lateral control (Ace or King) and one distributional control (singleton or chicane) 3NT = Fit. At least one lateral control (Ace or King) and NO singleton or chicane 4♣♦♥ = Splinter. No Ace or King lateral Over 3♠ or 3NT cue-bid can follow with some artificially to ask for singleton after 3♠