On the usability and GUI stuff, I'm afraid that what you see as absolutes are really just personal preferences, and if you are not willing to adapt or compromise, you should probably considering coding your own. Maybe find an open-source project as a starting point, and develope a new GUI. You may even find enough people share your opinions to make some money off it.
For the single MP3 issue, Podcast Addict can certainly do it, that's the only podcast app I've used.
Audio book players would all handle the single mp3, I'd imagine.
(I use Listen, which you probably wouldn't like because of the large play/pause screen area....I happen to agree with you on that, but it's a minor issue for me and hasn't been a problem.)
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