"Use descriptive URLs" and {Permalink} incompatible with FeedBurner FeedFlare

Adding FeedFlares from FeedBurner with "Use descriptive URLs" (i.e. /post/12345/post-title-here) enabled does not work. The reason is that the RSS feed for the Tumblelog still contains the "non-descriptive" URLs (i.e. /post/12345) in the <link /> tag for each post, the {Permalink} template variable contains the descriptive variant, and FeedFlares require that both be equal. This prevents the usage of {Permalink} to include FeedFlares on the blog, like this:


<script src="http://feeds.feedburner.com/~s/thesmilingpenguin?i={Permalink}" type="text/javascript" charset="utf-8"></script>


I've circumvented this by doing


<script src="http://feeds.feedburner.com/~s/thesmilingpenguin?i=http://thesmilingpenguin.com/post/{PostID}" type="text/javascript" charset="utf-8"></script>


instead, but it's not quite as nice. Is there any reason why the descriptive URLs are not used in the RSS feed?

I have posted this on the FeedBurner newsgroup as well:
http://groups.google.com/group/feedbu...

Thank you for your time.

Regards,
Martin
http://thesmilingpenguin.com