Media Library issus

[for]

Hi,
I'm a new user on iOS. After a few hours testing I found a few issues:

1) Split Album by Disc sorting problem:
If disc numbers are greater 10 sorting of ablums is wrong: albumname (disc 1), albumname (disc10), ...(disc 11), ...disc 2

2) If enable/disable Split Album by Disc option a complete rescan is necessary to apply to Media Library

3) M4B is a supported file format, but in my tests there is no support for chapters and playback doesn't resume on 'last position'

4) I would like to have an option to show AlbumArtist instead of Artist in Library Artist view. In my library are tons of compilations which tracks I tag AlbumArtist 'VA'. This way the Artists library view would be much more clearer: I only want to see artists where I have a complete album and not thousand of Artists which I have only 1 or 2 tracks in compilations.