It shocks me that this isn't a function already. Maptool has it and with a game that has a shifting variable for spell casting size, it's basically allowing the ruler to function as a spell marker. I don't know if it's hard or not, and really I guess I don't care? This has been suggested for over 5 years, consistently pushed by people that pay to use the site, and still there's nothing that shows any interest from the devs. Feedback, if nothing else, would be very much appreciated.