Features that I think are critical for striking the minimalism/utility balance for podcast editing:
- Enveloping per clip, i.e. fade in - fade out
- Support AU plugins (at least the system ones) - this alone will add EQ, compression and other effects, so quite important
- Ducking / side chain
- Option to embed all imported audios so that I can move my projects around
- Import a video file but use only the audio track
- Put time markers and name them
- Go to time or marker
- Loop between two markers
- iPad version?
These are just off the top of my head.
Kudos to you guys and good luck with the project!