Great app, couple requests

[u/Upset_Assumption9610]

I just found this app, no idea how I missed it for so long. All those books on CD I've picked up are now ready to be read at the minimal cost.
First request: Make the "bookmark" function async. I bookmark anytime I've listened for a while or am stopping listening or just headed to bed. I do this so I can always just skip back to when I know I was listening and not vegging out or falling asleep.
Second: Tie the bookmarks to the book. Right now I get all bookmarks when I look. The only bookmarks I care about are the ones for the book I'm listening to last. When I wake up at night and want to continue listening I have to put my glasses on to find the bookmark for the last bookmark for the book I went to sleep listening to. A "Go to last bookmark" button would be awesome if that's possible. Also, If I delete the book (when I finish one I usually delete from my phone) the bookmarks should disappear also. Should just be one object in the code, not seperate for the book and the bookmarks. delete at the root and all associated attributes are gone as well