[Plugin: WPeMatico] Use feed date

Basics: By default, WPeMatico sets the date and time of the posts to that of the moment they’re created. By using this option, however, you can alter that behavior.

Use feed date: Enabled
How it works: To avoid incoherent dates due to lousy setup feeds, WPeMatico will use the feed date only if these conditions are met:
The feed item date is not too far in the past (specifically, as much time as the campaign frequency).
The fetched feed item date is not in the future.
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The problem is that I’m trying to import a feed with old post dates, so how can I make it keep the original feed item dates? It seems like it should be a simple hack on the code. WPeMatico is pretty much an updated WP-O-Matic (since WP-O-Matic is no longer supported). I found below fix I’m looking for, but it’s for the outdated WP-O-Matic and not WPeMatico.

Fix I’m looking for, but it’s for the outdated WP-O-Matic:
http://wordpress.org/support/topic/plugin-wp-o-matic-use-feed-date

WPeMatico Plugin looking for fix to use feed dates:
http://wordpress.org/plugins/wpematico/

Any help to solve this problem would be much appreciated.