On twitter tonight,
Question: "Can we look forward to more voice control before level 5 to maximize safety while driving? Since nearly everything you control on the Model 3 requires input on the screen. Thus, taking your eyes off of the road more than most other cars. Can’t wait for mine! Thanks!"
Elon: "Definitely. You will be able to do pretty much anything via voice command. Software team is focused on core Model 3 functionality right now, but that will be done soon, then we will add a lot more features."
Elon Musk on Twitter
This has been one of the few persistent criticisms of the Model 3 in many reviews.
Not sure if voice command would work for changing autopilot speed/follow distance. There is the possibility of using the right scroll wheel, currently quite underused, to allow adjustment for those settings without using the touchscreen.