Idea for a new tool: creating complex object shapes without the use of polygons.

Current situation
The polygon tool is now used to draw enclosed shapes in any form, but I guess we can improve the usability in cases where the shape actually consists of multiple 'single tile sized' objects connected to each other.

For example in the use case below, it can be drawn with the polygon tool, but because it has holes it requires to have some intersecting & diagonal lines. The output is also relatively hard to parse if you would like to know which tiles indices do actually have the defined object.

"polygon":[ { "x":0, "y":0 }, { "x":96, "y":0 }, { "x":96, "y":48 }, { "x":128, "y":48 }, { "x":128, "y":96 }, { "x":80, "y":96 }, { "x":80, "y":80 }, { "x":80, "y":64 }, { "x":64, "y":64 }, { "x":64, "y":80 }, { "x":80, "y":80 }, { "x":80, "y":112 }, { "x":32, "y":112 }, { "x":32, "y":96 }, { "x":0, "y":96 }, { "x":48, "y":48 }, { "x":64, "y":48 }, { "x":64, "y":16 }, { "x":48, "y":16 }, { "x":48, "y":48 }, { "x":0, "y":96 }],

Suggestion
What I would like to suggest is to create a tool which is limited to just the tile grid (as defined in the map). This tool would allow you to create an tile-sized objects, which can extend by drawing additional tile-sized objects on any border.

I can imagine the output format in one of the following two different options (taking the screenshot above as example):

Option 1:
An array of 'booleans' where every boolean tells you if the tile is used or not. The length of this array would always be the width * height in tiles. Our example object has a (calculated) width of 8 and a calculated height of 7 and would result in the following output:
tiles = [ 1,1,1,1,1,1,0,0, 1,1,1,0,1,1,0,0, 1,1,1,0,1,1,0,0, 1,1,1,1,1,1,1,1, 1,1,1,1,0,1,1,1, 1,1,1,1,1,1,1,1, 0,0,1,1,1,0,0,0 ]

Option 2:
An array of tile locations. Every location would be the delta tiles relative to the objects position. For example the following output would be the one for just the first row of tiles of the example object:
tiles = {{"x":0, "y":0}, {"x":1, "y":0}, {"x":2, "y":0}, {"x":3, "y":0}, {"x":4, "y":0}, {"x":5, "y":0}}

The issue names no implementation files, entry points, or tests. Start by locating the existing polygon tool and the code that serializes map objects, then compare the proposed tile-grid interaction and output formats with current editor conventions. Done would require an agreed design, implemented tool behavior, serialized output, and coverage for the example shape.