Nick Cody has written an addon that works with i-podder.js: BloglinesBlogRollExtractor.py
What it does, if i understand it right, is catch your podcast blogroll-opml file from bloglines and automatically rewrite the feeds.txt file.
So if you have a bloglines account you could make a podcast folder and add your favorite podcast-feeds in that folder, create a blogroll for that folder (this sets up an opml-feed) and the BloglinesBlogRollExtractor.py will make sure that your feeds.txt file that i-podder.js uses, is automatically synced with that folder.
This way you can control the feeds that i-podder.js scans from your bloglines account!