How to restyle GeoField's proximity filter controls? Background
I am using the modules: geocoder geofield addressfield geophp ip_geoloc libraries to create a store locator view. The user can search the available stores using an exposed GeoField proximity filter.

Question
How can I restyle the GeoField's proximity filter controls? I would like to change the edit box for distance to a select with fixed values, and hide the distance units select defaulting it to miles.
I had a similar issue with editing the exposed form. Form alter is not the right way to go though. You'll need to use element info alter. Take a look at this custom module I threw together for editing the geofield proximity search. You can see what I did, and add/modify functionalities for your needs (although I think i did exactly what you wanted).