I quite often use big documents in Write which have several headings on
different levels. Navigation in a such document is supported by the Navigator
quite well. If I open the [+] sign in the Headings row of the Navigator then the
paragraphs formatted as "Heading 1", "Heading 2", etc. occur in the Navigator as
a table-of-content tree. 

Because I have dozens of Headings in my document, I have to scroll a lot in the
Navigator window. I would like to open/close seldomly used branches of this tree
by [+]/[-] symbols, like in Microsoft Office I can. 

This would ease the navigation in a hierarhized document.