• Quick Reply
  If you enable Quick Reply, a box will appear on the showthread.php page allowing users to reply to the current thread without needing to load the full newreply.php page.
  
  When Quick Reply is enabled, you may specify whether or not users must click the Quick Reply icon in order to start typing in the Quick Reply editor.
  
  If you choose not to require a click, the system will not know to which post a user is replying, making both the threaded and hybrid display modes nonsensical.
  Note:

  We strongly recommend that you set the option to require a click if you use Quick Reply and have Threaded Mode available on your forums.
• Quick Edit
  By enabling Quick Edit, a click on the Edit button in a post will open an editor within that post via AJAX if the visitor's browser is compatible.
  
  Users may use the full editor by clicking the 'Go Advanced' button in the inline editor.
• Multi-Quote Enabled
  If this option is enabled, an additional button will appear on posts. A user may click as many of these buttons as they wish. Once they click a reply button, the content of each of the selected posts will be quoted and shown in the reply window.
• Multi-Quote Quote Limit
  Enter a value to limit the number of quotes that can be created with Multi-Quote, once this limit is reached the user will be unable to add any more quotes.
  Note:

  The Quote BB code can still be entered manually, this is not a limit on the number of quotes in a post.
• Minimum Characters Per Post
  If this number is set to a value greater than 0, users must enter at least that number of characters in each new post.
  Note:

  Setting this to 0 will not completely disable the minimum characters per post check. Users must always enter at least 1 character.
• Maximum Characters Per Post
  Posts that contain more characters than the value specified here will be rejected with a message telling the user to shorten their post.
  
  Set the value to 0 to disable this function.
• Maximum Characters Per Thread/Post Title
  Thread and post titles will be limited to this number of characters. Please choose a value larger than 0 and less than 251.
• Ignore Words in [QUOTE] Tags For Min Chars Check
  Setting this option to 'YES' will cause the system to not count words in [QUOTE] tags towards the total number of characters posted.
  
  The primary use for this is to prevent users posting messages with enormous quotes and a single short word of their own.
• Automatically Quote Post / Thread Title
  Setting this to 'Yes' will automatically fill the title field of new posts with either the thread or the parent post title, prefixed by 'Re: '.
  
  The user may specify their own title if they want to do so.
• Maximum Images Per Post
  When a new post is submitted or edited vBulletin will check the number of images and smilies in the text and reject it if the number is greater than the value specified here.
  
  Set the value to 0 to disable this function.
• Prevent 'SHOUTING'
  Prevent your users 'shouting' in their thread titles/message text by changing all-uppercase titles with at least this many characters to capitalization only on the first letters of some words.
  
  Set the value to 0 to disable this function.
  Note:

  Disable this for some international forums with different character sets, as this may cause problems.
• Minimum Time Between Posts
  You may prevent your users from flooding your forum with posts by activating this feature.
  
  By enabling floodcheck, you disallow users from making another post within a given time span of their last posting. In other words, if you set a floodcheck time span of 30 seconds, a user may not post again within 30 seconds of making his last post.
  Note:

  Administrators and moderators are exempt from floodcheck.
  Recommended: 30 seconds. Type the number of seconds only. Enter 0 to disable this function.
• Time Limit on Editing of Thread Title
  Specify the time-limit (in minutes) within which the thread title may be edited by the user whom started the thread.
• Time Limit on Adding a Poll to a Thread
  Specify the time-limit (in minutes) within which the thread may have a poll added to it.
• Time Limit on Editing of Posts
  Time limit (in minutes) to impose on editing of messages. After this time limit only moderators will be able edit or delete the message. 1 day is 1440 minutes.
  
  Set the value to 0 to allow users to edit their posts indefinitely.
• Time to Wait Before Starting to Display 'Last Edited by...'
  Time limit (in minutes) to allow user to edit the post without the "Last edited by..." message appearing at the bottom of the edited post.
• Log IP Addresses
  For security reasons, you may wish to display the IP address of the person posting a message.
• Post Edit History
  Enable this option to log the previous versions of posts when they are edited.
  
  Edits will not be logged if an 'edited by' notice is not displayed or updated. This occurs in the following situations:
  1. The editing user is in a group that does not show edited by notices and no reason for editing is specified.
  2. The post is edited quickly enough after being posted to trigger the Time to Wait Before Starting to Display 'Last Edited by...' option.

Note:

This will increase the amount of disk space used by vBulletin for database storage.