Use textfield instead of checkboxes in "Publish to"

Issue Summary

When selecting affiliates before submitting content in the field Domain access options, under "Publishing options:", all the affiliates are listed as checkbox. I have a lot of sub-domains that I created using this module and therefore the list of affiliates ends up being pretty long. How can I change the input type from checkboxes to textfield with autocomplete (I'm not sure how to go about creating a menu call back for autocomplete_path).