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Take a look into https://www.bitmex.com/ I haven't personally shorted any coins yet but this is a start.

You can't short coins that are not listed yet but I just wait until the initial excitement is over. Like Heidi said Bitmex has some nice pairs that you can short. Dash, Ether, Factom, ETC and a few others. Be careful using to much leverage.

Sure, but those coins aren't recent ICO's. It would be nice to have that facility and could reduce the pump and dump nature of ICO's.

Edit: It seems I misread your original post. I thought you said you prefer to short ICO's. It would be awesome if possible. In theory it could be done with ICO futures contracts if an exchange was especially on the ball and listed them very quickly.