There are plenty of summary_... settings available to customize that option 
What about a feature to auto-summarize long topics? For example, if a topic has more than 50 posts the users will see a summary of that topic?
This already exists, it’s called ‘Best Of’ mode and it displays the posts that have the most ‘interest’ (reading time, likes, replies, etc.)
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We actually changed the name of this to “summarize” since it’s a better description of the feature:
Shows up automatically for topics with >= 50 replies.
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Resurrection!
Have you thought of adding a “turn into Q&A” summarize button, which would simply bring posts loved by OP?