The "box" with the player and download link should be more customisable. It would require exposing of some (new?) variables like $embed_url, $audio_player, $feed_url and $download_text.
The default setting would look something like this
$audio_player </br>$download_text
Which would display the audio player that comes with powerpress, and the download text that already can be customized in the settings.
A customised version could look like
[audio:$embed_url] </br>$download_text <a href=$feed_url>RSS Feed</a>
This should be possible to do for each customised feed. UI example:
http://img190.imageshack.us/img190/3266/mocup.jpgAs a sidenote: You also need to expose the language setting for each customized feed