Centering of Map and ability of dragging center Map icon around
It would be nice if after doing a radius search around an area using the center of map feature that we had the ability to move the center map icon around the map.
That way we could quickly adjust where we exactly want the center of the map to be.
We'll look into this, but there are a couple viable workarounds for you that accomplish the same thing. At any time, you can either...
1) Right Click on the map and choose the search option to search from that new spot
2) Use the address search to find a new location and that then becomes the new center point.
If you are in Salesforce1, holding your finger on the map will add a pin to that location and make that the new center for a mobile search.