Justin, we have many rural areas without street numbers and found a solution using google docs for data entry rather than wrestling with the GD map pin.
We create a google doc spreadsheet form using the gd_fieldname headers used on our site. lat/long we obtain from google maps (right click map pin for “whats here” displays lat/long which is copy/pasted into form.
When form completed, this field and any others can be parsed the combined fields into 2separate lat/long fields. saves a lot of time in data entry and all of the geo data can be dealt with in one pass and import 1000 without hiccup. This parsing works for other fields where you may want to pull a nugget of info from a string.
What may seem like extra work has dropped our data entry time by 60% not wrestling with map api in GD (for our site). Average person can now search, find and enter 20 sites per hour including 20 data elements