Regarding question 5, I guess the bitcoin client will always answer with coinbasevalue because he expects you to solo mine and you need to provide your own address. Now I built a little proxy to intercept the answer and populate the value coinbasetxn data field and remove coinbasevalue. But if I run cgminer against it he complains with "No BTC address specified, unable to mine solo on http://127.0.0.1". Shouldn't he already have an address that is part of coinbasetxn. Why would I need to specify another one?