A button for maps to instantly add lighting walls around the transparent parts of an image.

Adding lighting manually for external images can be a huge pain especially for underground or maze-like maps, buildings too. I'd be super useful to be able to right-click an image on the map layer and have a button that just instantly walls off the transparent area/boarder. For example, if I had a building image on top of a grass image, you could right-click the building and click a single button to add walls around the buildings outer walls.

That is an interesting idea.  My thought, for that to be practical, Roll20 should also give a way for Dynamic Lighting walls to be broken, sub-divided, split. Because otherwise, an automatic wall around the image would make an impenetrable box and you wouldn't be able to put in Doors or Windows. 

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