WP Super Settings is a WordPress plugin by aspatti that allows you to do various generally required settings in WordPress which are otherwise not available directly.
Major settings/features in WP Super Settings 1.0.0 include:
Enable/Disable Autosave
Enable/Disable Revisions
Show/Hide Admin Bar
ShortCode for embedding other post(s) in current post
Download and info: http://wordpress.org/extend/plugins/wp-super-settings/