Is it really possible to add audio resume, the same way it works for video - asking to resume from last stop point or from the beginning. It's absolutely necessary feature for podcasts and long radio shows.
Technically sure it's possible. Looking at the newest database schema table (MyMusic60) for songs, there are 2 fields: iStartOffset and iEndOffset.
No idea if those will be used for a resume function, you'd best ask that on the Kodi forum.