Thanks for sharing the screenshot with the detailed comments. We’ve had one other request for this as can be found in the following post:
I have it tracked in our hit list… there hasn’t been a lot of interest shown for that feature yet, so we’ve been prioritizing some other highly requested features first. 
In the meantime, how are you generating the image? It appears to be a mix of traffic data, weather, and perhaps some other data. Some of the map generators have the ability to adjust the zoom and size directly in the URL. For example, check out this post about generating a traffic map.
In the map generator, there are options for adjusting the positioning, zoom, and resulting map size:
Perhaps your source has that option too?