The functionality of pressing ctrl+l just yesterday was able to be used by any player but as of today you have to be on as a GM to use the feature. I have players in my game that run two characters and adding a multiplier for low light vision on one of the tokens that they can control applies it to all of the tokens that they control. I suggest that the Ctrl+L be enabled for all players so that they can see what a token under there would be able to see without influence from the other tokens that they control.