Saturation curve and overlapping of edited colors

1. Saturations curve I would love to see a possibility to tweak color saturation with a curve where all the colors saturation amount could be seen at once. How to achieve this is beyond my understanding, but see it a logical feature. 2. Color editor overlapping I really really miss a possibility to see all color editor colors at the same time so I could see how much there is overlapping with individual tweaks. This I wonder how it already is not possible. Thanks for all the work behind this software.