I've had several customers ask for the ability to apply custom color palettes at a user or dashboard level. This would allow different teams inside organizations to brand their visualizations according to their teams/org.
This would be amazing. Our company has different products within it, each having its own color palette. If we could assign color palettes / brand kits to data sets, instead of on a global level, it would be so much easier. Right now, the only way to get all of our colors on there is to make a master color palette with all of the brands within it. That ends up being a lot of colors to navigate through.