It would be great if the microflow settings can be added as well when you call one as a submicroflow. Especially for confirmation, so you don't have to create a separate page where you then continue with another flow.
Another improvement that would be great, is if you add the option to have different microflows trigger from the button captions of the confirmation option, so that a proceed triggers a different microflow and a cancel triggers another microflow.
With the confirmation question, it would be nice if you can add context specific info, so add context information from the entity to the pop up dialogue.