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Although this feature is already implemented in XF, the option is slightly hidden(?).

Take a look at this discussion:

http://xenforo.com/community/threads/suggestion-advanced-search-results-topics.2082/

If you mean something along the lines of...

[ATTACH=full]1773[/ATTACH]

... I like it.

The  supplementary results could be displayed by default, with the ability  to collapse them using the small arrow. And the "Additional Results"  text could be linked to perform a separate search in that specific  thread.