I have a fairly big map in progress that I am building with art assets from the marketplace. I found that, if I would like to expand in the up or left direction, I have to move all the assets around, this causes a lot of problems. So my suggestion is to allow a feature to add to the map size and pick how many rows we want to add and in what direction. add ten rows on the top of the map as an example. I'm not sure if this is doable but it would be nice.