I am trying to change the checkboxes for the terms on the backend to radiobuttons.
I found this topic: https://wordpress.stackexchange.com/questions/7456/altering-the-appearance-of-custom-taxonomy-inputs however wich helped me doing this.
However, this will turn ALL terms checkboxes to radio buttons.

Is it possible to apply this only for one taxonomy?

My code:

    add_action('add_meta_boxes','mysite_add_meta_boxes',10,2);
    function mysite_add_meta_boxes($post_type, $post) {
      ob_start();
    }
    add_action('dbx_post_sidebar','mysite_dbx_post_sidebar');
    function mysite_dbx_post_sidebar() {
      $html = ob_get_clean();
      $html = str_replace('"checkbox"','"radio"',$html);
      echo $html;
    }

thanks