The default left-aligned format of the wrapped long headings in the Table of
Contents is very ugly (example based on
http://www.oooforum.org/forum/viewtopic.phtml?t=18224):

  I. THIS IS A RATHER LONG
  HEADING THAT EXTENDS OVER
  MULTIPLE LINES................1
    A. This Is A Multi-Line Sub
    Heading. Notice That It Has A
    Different Right Margin......3
    B. This Is A Second
    Multi-Line Sub Heading......4

Microsoft Office uses better layout, a custom paragraph width for the text of
the heading:

  I. THIS IS A RATHER LONG
  HEADING THAT EXTENDS OVER
  MULTIPLE LINES................1
    A. This Is A Multi-Line
    Sub Heading. Notice That
    It Has A Different Right
    Margin......................3
    B. This Is A Second
    Multi-Line Sub Heading......4

(By the way, also justicifation is better, than the recent layout:

  I.   THIS   IS  A  RATHER  LONG
  HEADING   THAT   EXTENDS   OVER
  MULTIPLE LINES................1
    A.  This  Is A Multi-Line Sub
    Heading.  Notice  That It Has
    A Different Right Margin....3
    B.  This  Is  A  Second Multi-
    Line Sub Heading............4
)