I think Turbotax got updated. Now it does allow me to import 1099-DIV and 1099-B for different taxpayers in my family. I don't know if all the other related issues other users encountered still exist since I didn't go any farther yet, but at least I don't have to manually type in every sale entry from 1099-B, which would be absolutely absurd (as others stated). Try it out today and see if the import works for you. Good luck.
