Lot of custom functions are ready to use. Just give a tick mark. Which one you tick only those functions will load. No extra css or js. Some of the functions are

• Change amount of posts on the home page.
• Change amount of posts on the search page.
• Change length of excerpt.
• Automatically mark as spam all comments with an url longer than set chars.
• Set the post revisions unless the constant was set in wp-config.php already.
• Control When Your Posts are Available via RSS.
• Automatically empty trash after set days.
• Change Admin footer.
• Add favicon to head.
• Remove unnecessary links from wp_head.
• Redirect to home page after login.
• Hide admin bar from front end for non admin.
• Disable back end access for non admin users.
• Login with both Email/username.
• Show only own uploaded media in library.
• Restrict user to upload only jpg,jpeg,png,gif type of media.
• Stop images getting wrapped up in p tags when they get dumped out with the_content() for easier theme styling,
• Call the google CDN version of jQuery for the frontend.
• Call Googles HTML5 Shim, but only for users on old versions of IE.
• Change login screen error messages to “Think you have gone wrong somwhere!”.
• Show post thumbnail in RSS Feeds.
• Disable RSS Feeds.
• Display the Most Accurate Comment Count.
• Custom admin menu link for all settings.
• Enable admin to set custom background images in ‘appearance > background’.
• Remove pings to self.
• Sharpening resized jpg images.
• Enable Gzip.
• Prevent user email change from profile.
• Block comments with no-referrer.
• Remove word “Private: ” infront of title of private post/page.
• Disable the theme/plugin editor in Admin.
• Disallow anything that creates, deletes, or updates core, plugin, or theme files.
• No more jumping for read more link.
• Enable custom Breadcrumbs.
• Disable Search in WordPress.
• Disable Admin nag.
• Remove wordpress version number.