Limit Map Size - each of the four directions separately

[KillerAnt]

Hello Factorio team,

I would like to ask whether you could consider for the future that the map size can be limited into each of the four directions separately. So that one could e.g. limit North: 100 tiles, South: 100 tiles, West: 100 tiles, East: no limit, to allow for only one direction for expansion, or to start "in a corner" with serious expansion possible only to the North and West, or something like that.