Shortness ask is not bad...since the 4M bidder always has a short suit. But i dont think its standard, I play it as a cuebid, and I think most people play this control-showing. Referring to that 1M-4M thread, I think its North to blame. I think that a hand like this with 2Ks is already a very very good hand one can have, which means that even if responder has short Diamond, Slam is still not quite likely to make. Btw, I'm not going to risk my 4H, it may go down easily