I'd like it if there were separate buttons for (a) reset a section (e.g. colors) back to the default and (b) do not use a section (e.g. colors). Right now, turning (e.g.) colors off loses the settings there. Maybe I missed something though.
Allow editing numbers to right directly, instead of only using the slider. I really dislike using sliders beyond a first general impression because it is too slow to get things exactly as I want them. I would guess this is a relatively common sentiment.
One feature I don't see but would love to see is text overlay, but that is perhaps moving away from the spirit of the project.
We have widgets that do this in Ardour and they were far from simple to implement.
a) the Ø at the right of a section resets the section's settings back to default zeros (it becomes white when available) b) closing a section doesn't lose it's settings, unless of course it has been reset
As for a button that allows to "temporarily" disable a section (but keeping it's modified settings underneath), yes it's a very good idea