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I'd really like such a feature too.
I monitor many feeds that often update news or post
additional information a little while later, so this would be
really helpful. I then could finally exclusively use RSS Bandit
and abandon the other feed reader I have to use for those
important updated feeds.

Maybe you could gibe it an option in the main/category/feed
configuration to let users decide if they want to use it (since
a dev mentioned speed concerns in the forum).