Combining Wikis

Is it possible to combine two wikis on the same plugin into a single wiki or can I export/import to achieve the same thing?. The wiki being transferred would simply become a subwiki of the main wiki.

Is it possible to change the page title after it is first created? I would occasionally need to redefine or correct one.

The widget shows all levels of subwikis. I have selected ‘Only Top Level:’ =Yes. I expected that it would only show the top level but I see everything. To be able to enter “View X no of levels” would be great!

Thank you for your help