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<?php
function the_aim_theme_preprocess_taxonomy_menu_block(&$variables){

  //only for block with delta == 1
  if ( 1 == $variables['config']['delta']) {

    $links = menu_tree('main-menu');
    $main_links = array();

    foreach ($links as $link) {
      if(isset($link['#original_link']) && !empty($link['#original_link'])) {
        $original_link = $link['#original_link'];
        $main_links[$original_link['mlid']] = array('name'=>$original_link['link_title'], 'path'=> $original_link['link_path'], 'depth'=>0, 'parents'=>array(), 'active_trail'=>'0', 'children'=>array());
      }
    }
    
    //switch both arrays in the merge if you want the term links to be appended or prepended
    $variables['items'] = array_merge($main_links,$variables['items']);
  }
}