Reading through them confirmed that it should be possible to write a RSS-import extension. However, your issue seems to concern standard-compliance with feeds in general, meaning you should report the issue there : http://issues.ez.no/ezpublish.
Cheers,
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Nicolas Pastorino
Director Community - eZ
Member of the Community Project Board
We would like to see a solution to this. The use of <content:encoded> tag in RSS feeds really is very common, I think eZ Publish should handle it out of the box. Has anyone written an extension to handle this tag?