[REQ] "Custom Colors" option to the dropdown menu as preset

[vanowm]

When we change color manually it shows it as "Custom Colors", but when we select a preset our custom colors is gone and the only way restore it is use the slider.
It would be nice if "Custom Colors" was added as a preset (manually changing color would affect that preset), this way we don't have to remember what was the color before we switched to another preset.

Thank you.