Auto complete non-text CCK field?

Is there any way at all to make it auto complete using tokens on a non-text field? At the moment only text fields are showing up in the OpenLayers WKT table. I'd really like to populate a taxonomy with terms generated from OpenLayers tokens like, city name, venue name etc..

Or does anyone know of a module that can do this.. i've found Geo Taxonomy Geocoder (http://drupal.org/node/861836) but it's not really doing what i want, and still requires a 'manual entry' in the CCK taxonomy field for its term name.

thanks!