I think a vision setting for "see invisible" and a token property for "invisible" would be awesome. This way, it's easy to toggle when folks are using invisibility, etc. I have to use transparent tokens and assignments now, like the above. It takes a lot of doing, assuming the player(s) have a way to see the invisible thingy. Frankly, it would be awesome if this could also be included in the GM vision preview, that way the GM could use it to see what the "token" sees, and be somewhat blind to the movements of the invisible character too. Not necessary, but still a pretty cool way to use it from a GM perspective.