While building models the color palette in the workshop works okay.
But compared to my personal perception of LEGO colors they don't quite match (mostly I find them to be too saturated, some of them not in the right luminance). I always have to go the long way with Photoshop to change colors of the renders (and since I have to alter different colors differently masking can become a long process).
I don't want to suggest that you change the color rendition that all users are used to.
But could you imagine a way a user could alter them to personal taste? Different ideas:

• have a personal settings page with RGB values for LEGO colors which override mecabricks default colors. Two checkboxes [ ] use in workshop [ ] use for rendering
• same as above, but even two RGB values, one for workshop color override, one for rendering (no more checkboxes needed)
• if this is not possible/wanted, another enhancement would help me: export rendering with mask channels (maybe as PSD). One mask for each color. So I could easily tweak the color rendition in Photoshop with perfect masks 😃 I could imagine you could get those masks without the render engine by using the viewport?