1) Which weapon should go on the mainhand and which on the offhand? My instincts tell me the stronger weapon goes to Mainhand, but the main post's explanation regarding Runeforging suggests the opposite. Also, expertise now translates to spell-hit, and the human racial bonus is given only if the sword is on mainhand.
2) As a human, I get a 1% expertise bonus only to my sword, and not the axe. I would expect this to change my expertise stat weights - probably a sort of softest-cap at 6.5%, and then the usual 7.5% soft cap. What stat weights should I be using for this?