For years I used Campaign Cartographer, which while it is a good program, Roll20 is far easier to use. One of the functions I miss though is a way to break into a line without erasing the whole line. Case in point, you create a circular room (using a circle), and your dungeon has at least one hallway exit from the room. So you draw the circle, then draw the connecting hallway. The way it is now, you can put a door icon where the two meet, but you cannot open the circle to allow an open hallway entrance. The best solution would be to allow the circle to be breached, and then be able to erase from one intersection to the next, without erasing anything else. this would also work for breaking into a polygon/line segment. The easiest way would be (from my point-of-view) to require two lines (the width of the breach), and erasing only the space between the two lines. Alternatively clicking two points along a continuous line and erasing only the shortest distance. Any ideas?