It is on production. You can find the option "Primary key name" in Additional properties tab. See screenshot:

It is on production.

After a discussion in Vertabelo team we don't see the way how to support NoSQL database in our product. So I close the topic.

We analyzed this from UX perspective and decided not to do this. Current displays have a huge width but height is usually small, especially in laptops. There is no space for the properties panel at the bottom.