So I figured out a way to indicate a character's Darkvision; just set their token with a light source of 60' that begins dim light at 0'. However, we play on a community tablet as a battlemap during live games. So dim light from a Dwarf with darkvision mixes with the dim light of the human's lantern. If I could tint the light enough that we could tell the difference between the darkvision of a token and the light of another, that would be awesome. Then possibly set a priority to determine which is always on top; in this case it would be the human's lantern as it is light that everyone can see. So the Everyone Can See toggle would put it on top of any light sources without the toggle.