Multiple Paint Regions on a Block
To use the wall as an example, currently, I can only paint the entire block, minus that which is masked out as unpaintable. I totally follow that there are some regions of a block that ought be unpaintable, but I would love to be able to have some more granularity on painting blocks. I'd love to have two or even three regions (whatever would be appropriate per block) that are paintable in different colors.
To continue the example, instead of having this region be unpaintable, let me paint this region in a different color from the rest of the block (the current default behavior could obviously be maintained by having the secondary color default to black on this specific block).
I think this would need to come with a few ancillary changes to the paintgun: a swappable quick-pallet where you can swap between two things with a simple click (like the foreground/background swatch swap in Photoshop).
I like this feedback 
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