I wonder that this is essentially two settings for one effect. Further, if you say you want geojson, you'll still get the "latitude" and "longitude" fields, essentially duplicating your data.

How about this -

A setting "coordinate format" (perhaps a better name needs proposing) that has two possible settings: geojson, and ... something else that indicates the current default of two fields (latitude + longitude).

This way we reduce this PR to only adding 1 new setting *and* we avoid duplicating data. Thoughts?