The MC fetches a premium now so I would think that will stay the same for the duration unless as in the newer Sport auto things get a lot better for the auto.
It's not always easy comparing values largely because the autos tend to cover more miles than the MC Shift cars and with skyhook - as many are - the MC Shift was £6k more expensive new.
I'm not as sure about the next point but watching the market I seem to think the MC Shift cars seem to change hands more often as they are viewed more as a weekend fun car. Happy to be shot down on that one mind!