This is important and should be a given. But the more interesting challenge is to highlight the object you’re editing (where your cursor is). It’s not clear even how to exactly visualize it (it could be inside subtract of union of subtract etc).

It moves or grows or whatever. What other indication you want?

I have not yet invented any other improvement.

I tried decimal points, but that was stupid, you just add "/100" if you want micrometer accuracy.