Disable the taxonomy/term display by default

Taxonomy_Manager is most useful for its management of taxonomy terms, most users would probably be more likely to use Views or Panels to override the default taxonomy/term/%term display, so it would be best if taxonomy_manager_disable_merge_redirect was set to TRUE by default. Alternatively, restructure it so that instead of disabling the merge_redirect value you're enabling it, i.e. the variable would become taxonomy_manager_enable_merge_redirect and set to FALSE by default.