Stupid panels content categories getting you down?

example.module

<?php

/**
 * @file
 * 
 * Replaces all of the panels content categories with a single "All" tab. 
 * 
 * To enable, simply do the following:
 *  - Search & replace "example" with your module name.
 *  - Run `drush vset example_panels_all_category 1`
 *  - Clear your caches.
 * 
 * To disable, run the following drush command:
 *  - drush vdel example_panels_all_category
 */

/**
 * Implements hook_ctools_content_subtype_alter().
 */
function example_ctools_content_subtype_alter(&$subtype, $plugin) {
  if (variable_get('example_panels_all_category', FALSE)) {
    // Put all the content options into an "All" container.
    $subtype['category'] = 'All';

    // Use a custom preview render callback which just prints out the basic
    // identifier, rather than trying to render it.
    $subtype['render callback'] = 'example_ctools_render';
  }
}

/**
 * Custom preview render callback for panels "add content" interface.
 *
 * @see example_ctools_content_subtype_alter().
 */
function example_ctools_render($not_sure) {
  // Printing out the delta rather than a rendered preview.
  $block->content = '<p>' . $not_sure . '</p>';
  $block->delta   = '';
  return $block;
}