Could it be worked out so that right-clicking anywhere on a big-icon in the map editor will register the object?
Currently, you have to find the bottom left tile, instead of being able to click anywhere on the graphic...

Also possible to make Fill will work with big-icons? Pretty much like Add does now, but in an intentional rectangle.

Also, if a big-icon is too big (like a 17x17 tile title screen) moving a single tile away from it on the map editor will make it completely disappear.