I'm aware of this "sub-area" not being considered. But there are dozens of ways to implement them. I'm struggling to find the most logical way to add this feature without causing confusion to the end-user. Although I am experimenting on this feature actively and will release the feature soon
Really good and intuitive. Way faster than switching from one workspace to another.
It would be perfect if you could also switch from one sub-editor to another. I think it's called "Editor Type" or "Editor Mode" in Python.
When I need it, I personally take too much time switching to the World material and back again to the material of the object. I also switch the Outliner from "View Layer" to "Blender File" from time to time.
Here’s the list of all sub-editors I found:
Thank you very much for your work!