Custom zoom per map

Currently, you have the option to zoom in to the maximum on a map to further detail the countries to be drawn. But I think it would be a good option for all map creators to have an option within the map editor that allows us to set a custom zoom (so, the default to play would be 100%, but could be changed up to 150% or 50% with respect to the original map). I think this would help to have more options for the maps and from the same large map you could get several more detailed or less detailed maps depending on the specific need of the map maker and it could help in case you can not increase the maximum possible resolution when uploading the background of a map (which so far I understand is 10k x10k pixels).