While it's perfectly possible to create custom meshes from vertices in Babylon.js and color them it's not really within the scope of this plugin.
So if I did open that can of worms it would be at a much later point in development sadly (certainly after 1.0).
To be fair there is already some vertex displacement going on with the recent ramp property for the box behavior which might be expanded upon in future updates.
Always been looking to learn from other plugins best to my ability, but to be frank a lot of what Rojo does just goes over my head.
Thanks for your feedback and interest in the plugin!