Thanks and welcome to the Community . If you want to and if you have time, please do
Introduce Yourself 
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Great suggestion. It’s not on the roadmap right now but we’d welcome feedback from anyone who’d find that useful.
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By Controllers do you mean sliders/toggles etc? I’d love to know more about what you want to achieve.
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Mesh colors applied to Grasshopper should already be applied and visible in the viewer. The below commit was entirely GH created.
Or am I missing what you are asking???