Multi - Quote facility is already existing, though not too prominent and works a bit differently in phpBB. When you are in Full Editor mode for your reply, you can scroll down below the reply area and see all the replies on the thread either using Scroll Bar OR clicking on the Expand View link. Against each post, there is a "Quote" button which you can click and use to Multi-Quote.
Here's a screen-shot explaining the same:
How to, plan a trip, book a stay, become a scout.
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