Simple Token Setting to Ignore Dynamic Lighting Barriers

Currently, no option to give a PC sheet or even an NPC sheet useable blindsight. Seems like a very simple feature to simply add a token option in the edit area to 'ignore Dynamic Lighting boundaries' in the vision part.

How would this avoid allowing players to see through walls? And walk through them too? It seems like it needs to be more complicated to discriminate walls from darkness, maybe requiring the dynamic lighting barriers to be a specific color?  

For "blindsight" (like echolocation, being able to sense your surroundings even in darkness) wouldn't you just use Roll20's "Night Vision" setting under a token's dynamic lighting? That exists. I'm not aware of blindsight going through walls in D&D.  For X-Ray vision (able to see thru walls), it would be cool if a Token could ignore DL walls. For Ethereal (able to walk thru walls), it also would be cool if a Token could be set to ignore DL walls.