More than 5?

apologies for the delay.

For now you could write add the below function to your theme. Replace the "10" below with the number you want

function theme_tagnode_view_taggees($tagnode,$teaser,$number_to_show) {
  $number_i_really_want_to_show = 10;
  $returnhtml = "";
  if ($teaser) return theme("tagnode_view_taggees_teaser",$tagnode->tagnode->vid,$tagnode->tagnode->tid,$tagnode->tagnode->taggable_types);
  foreach($tagnode->tagnode->taggable_types as $taggable_type) {
      $returnhtml.=theme("list_tagnode_taggees_by_type", $tagnode,$taggable_type, $number_i_really_want_to_show);
  }
  return $returnhtml;
}