It is not possible to have one page associated in multiple locations in the page hierarchy. Often a page fits in more than one place in a wiki structure.
In other Wikis this is quite a normal feature.

Example:
We have general documentation and team internal documentation. Some team docs are of general interest. Then I would like to add this page to the general documentation, keeping the original page in the team docs.
At the moment I worked it around via a second page which uses the "Include Page" macro. But then only the original page can be edited.