Just use the Ctrl+C (copy) Ctrl+X (cut) Ctrl+V (paste) shortcuts to copy, paste and cut pages from your documents. Either within a document or from one document to another. Select the page you want to copy/cut/paste from the document thumbnails...
Note that you cannot currently select multiple pages. And you can't do a right-click cut, copy, paste operation. If you attempt this you will see a Paste flag which upon selection produces the following info warning...
If you copy text from another text editor - Word for example and past it with Crtl + v it will retain the same style as the originating document.
If you use the "Internal paste" button the text will take the same style as the destination document.