Legs, I know the run up to the dropping of the bomb was a joint effort and I am certain that those non-american allies were consulted. I mean, can you imagine the bomb being dropped and Churchill saying 'WTF?'. No but really I imagine the people that needed to know were consulted.
The effort needed for the jerried to research, build and develop a nuclear bomb would have exhausted them (whilst still fighting a conventional war) and though may built two bombs and use them, they would still have lost, people might not like hearing it, but even after England got bombed say, the Allies would still have kept fighting and would have still one.
Just reading the United States Strategic Bombing Survey (Pacific), it clearly shows the Japanese knew they were getting hammered and were seeking some form of peace.
I found an online copy of the above survey,
http://www.ibiblio.org/hyperwar/AAF/USSBS-PTO-Summary.html#jstetw goto pages 25 and 26.