Not sure if there's a fix for this that I'm not aware of, but it would be great if a manual eraser tool existed for dynamic lighting boundary creation. A problem I keep running into is setting boundaries for a circular room, which is easy to set boundaries for using the Ellipse tool, but if there's an open entrance to the room somewhere along the boundary, I can't make that clear to the players without explicitly telling them and moving them. Imagine a circular circus tent with a large, open-air entrance. To set dynamic lighting for the tent, you use the ellipse tool, but the entrance is now a line of sight blocker. This is where a manual erase tool would be handy for dynamic light boundary creation so you could trim the boundaries in oddly shaped rooms. The only way around this problem that I can think of is the extremely tedious process of using the polygon tool and clicking around the circular room, but that takes forever and doesn't make the room look perfectly circular from the player POV.