Some nice changes here. However, I am somewhat concerned about the "Flow per feature" feature. I suspect people will try to fix levelling or printer issues by changing these settings instead. Only giving them more issues with over or under extrusion in different parts.
As a person who gives a lot of advice on how to slice with Cura, I often see suggestions in facebook groups that only hides the symptoms and not addresses the cause of an issue. Like "increase first layer flow" instead of reduce the distance between the bed and nozzle. Or "increase flow" instead of fixing a slipping extruder or printing at the correct temp. Not saying that we should never mask symptoms but if we don't know what we are doing, this could lead to more issues. Trying to troubleshoot a print where the poster has dabbled with different flow settings would also become more difficult.
My suggestion is to add a carefully worded tool-tip to these settings, that tells the user to use them with caution or to check the hardware for issues first.
Anyway, thanks for an excellent software!