I asked in their thread and they explained with a script that has to be run. I let it check out another shareholder and he said it's not really working. At the very least every shareholder would have to provide a btc address and the rest would have to get the payment in nxt.

What ways to do so do you have in mind? Shapeshift is pretty expensive as far as i remember. It would be way better to exchange nxt to bitcoins on a normal exchange than using shapeshift. Or do i mix something up?