Checkpoints of varied sizes (or specifiable size) about space-race

[jaythomas]

The checkpoints are both the same aspect ratio and you can determine their orientation by rotating the spawn point. Since points in tiled can't have a rotation this can be done by setting down a rectangle that represents your spawn location and rotating the rectangle accordingly. See no_planets.tmx for an example.

For the standard checkpoints it should be trivial to make it variable width if we define the spawn points as rectangles like I mentioned and then adjusting the dimensions and rotation of the rectangle to your liking. If that would solve your use case let me know and I can implement it that way.