Most of those threads really don't address cbj's blindspot, however. They discuss the side view mirror blind spot (which really isn't there in the first place.)
Yes, the fortwo does have a rather large "limited field of view through the back window, in large part because of the headrests. Having your seat up and the passenger seat back only makes it worst. Really nothing you can do about it, other then just being plan careful backing up!
The auto shifting will get better, but will always be a little quirky. Can always use it in manual mode!