Hello,
To facilitate the filling of the regions field, I would like to include a list of ISO 3166 country codes (specifically the 2 letters form). What would be nice, would be to be able to search for either the country name or the 2 letters code, and then it would fill the code.

However, it seems that with the sane_default attribute, the same text is displayed in the drop-down and then filled. Is it somehow possible to do something like an HTML select tag, with a different option value and displayed value? For instance:

<option value="lu">Luxembourg (lu)</option>

If it's not a good idea, let me know as well :)