In hidden content (for client privacy)
I was able to center the map by placing a marker where I wanted it, making it first in the order of pins, then using css to suppress the pin. Some OSM modules provide a separate parameter for map center.
But I can't get the Pacific regions to render on the left side no matter what order I stack the markers in. There seems to be no way I can have the Pacific markers left, Atlantic markers right, the American continents (and the client's home office) in the edit: middle 33% but several degrees north of map center.