Foreman's os_selected method. Last seen at -> https://github.com/theforeman/foreman/blob/develop/app/assets/javascripts/host_edit.js#L358
has code that looks like this
attrs = attribute_hash(['operatingsystem_id', 'organization_id', 'location_id']) limiting the number of attributes to the server for media selection to 4 parameters. This makes it very hard for Katello and Other foreman plugin apps to have control over that section of the medium even with facilities like Deface.
We need to make os_selected call actually send the full form as part of the hash, so that this can be used by the backend controllers.

We need os_selected to do something along the lines of

function os_selected(element){
  update_form(element);
  update_provisioning_image();
}