Well, pitch & speed are easy, whenever they are not 0, they are changed 😉
The other settings is not possible as they are read from the database. I would need to compare this to the file and do that for all songs in a list. That takes too much time.
You can reset the volume to the replaygain value by tapping the refresh button in the song details view.
If you change replaygain settings in the audio file, you just need to refresh the song list and it will update all changed songs. What does not work is to reset the volume for all songs to that of the audio files but this is a design decision as you could mess up your custom tweaked settings by accident that way.