Hi Cold - yes I do expect to add more history functionality to allow some more kinds of edits and updating like you're asking about.

For mirror that is actually working currently in certain circumstances, like if you mirror a curve you can then edit the curve's control points and the mirrored copy will update automatically.

But it won't work if you do some other operations to the original object such as trims or booleans. That is something that I do want to improve in the future though.

- Michael