I seem to be having the opposite experience as you; I can make text part red, part black just fine.
I'm pretty sure the old typewriter I played with as a child didn't have a "shift" key for that but a toggle switch of some sort. I am also pretty sure that I could type a lot faster on that than I can on this simulation. (I took typewriting lessons at school as an elective.)
(I think it might have been an old Remington and I think my parents bought it used.)