(text copied from http://www.vim.org/scripts/script.php?script_id=2447)
Version imported into this repo : 0.2.31

Pago is probably the most powerful terminal-based screenwriting script available for any platform, and allows the use of vim as a fully-functional piece of screenwriting software such as Final Draft or Celtx.  While some elements of the script are unstable, it undergoes daily testing and revision, becoming more mature as I use it every day for my own screenwriting projects.

PLEASE PROVIDE ME WITH FEEDBACK if you use or test this software -- any comments or requested features will be given full consideration.  (zazaian (at) gmail (dot) com).  Your thoughts are essential to developing this program into a piece of software that best serves the open source community.

Overview
========
* Supports all major formatting elements of a screenplay, based on both logical and commonly accepted conventions of the screenplay form.
* Automatically enforces all boundaries within each screenplay element, ensuring proper formatting to the exact specifications of a screenplay.
* Allows access to all six available screenplay ELEMENTS without any complex keyboard shortcuts or commands, using only the keys <Backspace>, <Tab>, <Enter>, <Up>, <Down>, <Left>, <Right>.
* Allows easy cycling through blank screenplay elements using both the <Tab> and <Backspace> keys.

  Features
  ========
  * Pressing TAB cycles through empty screenplay elements in the order:

    ACTION --> DIALOGUE --> PARENTHETICAL --> CHARACTER --> TRANSITION --> ACTION

    * Pressing <Tab> from a blank TRANSITION element will cycle back to the
      beginning of the line, triggering a blank ACTION element.

    * Parentheses are automatically inserted when calling a blank PARENTHETICAL
      element.  Pressing <Tab> from within blank parentheses will automatically
      delete the parentheses and jump to a blank CHARACTER element.

    * A colon (":") is automatically inserted at the end of the line when an
      TRANSITION element is called.  The cursor remains at the spot of the colon
      when text is either entered or deleted.
      
      * Text typed within a TRANSITION element is automatically RIGHT-JUSTIFIED.

      * Pressing <Enter> from a TRANSITION element jumps two lines down the page
        and prompts a blank SCENE HEADING element.

  * Pressing <Backspace> on an empty line cycles through empty screenplay elements
    in the reverse order:

    TRANSITION --> CHARACTER --> PARENTHETICAL --> DIALOGUE --> ACTION
    --> END OF PREVIOUS ELEMENT

    * Pressing <Backspace> from a blank line jumps to the end of the previous
      element or, if the above two lines are blank, will create a blank ACTION
      element two lines above the previous cursorline.
    
    * Pressing <Backspace> on a line with text will delete the character to the
      left of the cursor.

  * All text typed with a SCENE HEADING, CHARACTER, or TRANSITION element will be
    automatically CAPITALIZED.

  * To create a SCENE HEADING element, press enter while in a blank ACTION element.
    The Cursorline will be HIGHLIGHTED and all text typed within the element will
    be CAPITALIZED.

  * While in a blank SCENE HEADING element:
    * Press the <Space> bar to cycle through the common prefixes INT., EXT., and
      INT./EXT.
    * Press <Enter> to jump down two lines to a new, blank ACTION element.

  * Active screenplay element is displayed in CAPS in the status bar.

  * Page number is displayed in the status bar.  This estimates the number of pages
    within your screeplay using a 56-line-per-page standard.

  * Pressing <Up> in either INSERT or NORMAL modes jumps to the beginning of the
    line above the cursorline.

  * Pressing <Down> in either INSERT or NORMAL modes jumps to the end of the
    line above the cursorline.

  * Holding <Left> in either INSERT or NORMAL modes scrolls through to the
    beginning of the current element, then jumps to the end of the previous
    element.

  * Holding <Right> in either INSERT or NORMAL modes scrolls through to the
    end of the current element, then jumps to the beginning of the next
    element.

  * Typing text within a screenplay element such as DIALOGUE or ACTION will
    automatically reformat the paragraph if text exceeds the preset end of the
    line.  This improves upon use of the :tw (text width) and :wrap commands by
    formatting text that is typed within a paragraph, rather than simply at the end
    of it.