I'm not a programmer or anything of that sort so I won't claim to know how difficult this would be, just thought of it as something I would use and thought could be used by lots of people. Basically what I would suggest is to make a new layer that specifically recognizes any lines or shapes you make as objects. These objects would then be assigned an editable value of how many squares (or hexes) the 'shadow' is cast. Basically this is to give you an automatic Fog of War based off the position of your token. I'm assuming everyone's token would be assigned a 'forward' facing side and that the already in place rotating mechanics would help. It would make things like daytime stealth a little easier for everyone to agree on who exactly see's what, especially when my hand slips and I accidentally reveal too much with the FoW tool. Thanks for everything you've done in helping my D&D groups come together. I'm very grateful. J