I finally found out how to quick quote multiple posts.
But if a thread has multiple pages (let´s say four), how do I quick quote one post at page 1 and another at page 4? The text in the quick replay box disappears when I change page.
Bump
I never use the Quick Reply features myself, but I don't think you can do what you're asking with the Quick Quote. You'd have to use the regular Quote feature and paste the earlier pages.