You can multiQuote if posts are on the same page (click on Reply on each messages you want to quote, it will be added to the quick reply at the bottom).
Missing/requesting feature:
It just needs to be restored when switching pages, like the "don't loose anything" feature when closing the tab. you could even start replying to the first quote, click the next "reply" and so on, and it will be kept until you post your message.
Edit:
Or maybe you are talking about nested quotes?
That's indeed something which I miss too, as like you see, I quoted you but we can't tell what you were talking about.