The current gradientfilter is hard to manage and visually unintuitive while both photoshop and substance designer have proper implementations where you can add color on a gradient and visually move them around.
Just the base functionality of the gradientbar with its colors would be great , all the additional features like the presets and fading between points would be even better,
current one from the Gradient filter
suggested one from photoshops GradientMap
Substance Designer implementation