The fact that you proxy feeds locally on DW complicates things somewhat. what I'd really like to do is take the exported OPML from my local (desktop) RSS client, and feed it in to DW. In that case, identifying the local feed corresponding to those would be necessary. The win for me would be much easier overall feed management.

On the export side, you've got the distinction between the source upstream feed, and the locally proxied DW feed. All else being equal, I'd prefer disambiguation to the source.