Players have no access to the dynamic lighting layer, so they couldn't get to the line to toggle it anyway. At this point, something on one layer has no effect on something on another layer. Until there is something like that available as part of the vtt, only the GM will have access to (and control over) things on any layer other than the object/token layer. The only way around that is to use the api. Door Knocker is pretty simple, especially if all you are using it for is to open and close doors. Just add a token action macro that is visible to everyone and they can toggle doors open or closed. If you always use a specific color to make doors like I do, it just takes one command for the api to recognize that color as which lines it can control. It has built in default colors, but they are easily changed, so you don't need to redo any doors unless you have used multiple colors.