3rd down back has been in the game for years as a depth chart position (there is no such thing as an official NFL position of “3rd down back.” Just players who fill the role. Sometimes its a rb, sometimes a fb, sometimes a wr), and last year they added some names to some of the generated rookies (although not created or edited by the user).
But I agree with most of your list.
Regading positions, they also need depth chart positions of NT, Nickleback/slot corner, Leo/Edge, Mike, Will, Sam and Jack (teams have different names for the second MLB in 3-4, but that is one of them). The depth chart categories in the game are WAY outdated.