Add a option to change which fields are being used for the google maps widget

Since most of our customers are actually in china, the addresses and google maps don't mix very well together. What mixes much better are actual latitude and longitude data. So I added a small piece of code that the google maps widget actually uses a custom field which contains the lat,lng instead of using the address fields, but best would be if I could configure this somewhere.

Can we add a configuration in the vtiger admin somewhere to configure which fields are actually being used for the google maps widget?