Often times I want to add a lot of presets at once, but the preset window closes as soon as I add one. All those extra clicks do add up. Maybe keep the preset window open, maybe add a dedicated button and keyboard shortcut to create a new preset in the next blank slot.
With the "show editor" button I think that an option to have it close when you click outside the dedicated editor window (except on the associated preset manager button) would help. An option for all the popup windows to "share" the same widow, so that only one editor was open at a time would help too. Barring that, escape or some other key to close would be easier. The close button is smaller than standard, which makes it somewhat slower to target.