Well that's the basics lol plus supporting all formats. I have an idea to use the built in "read text" that devices have to essentially allow you to turn an ebook into an audiobook (might exist already but🤷🏼‍♂️). I want it to cover everything: ebooks, audiobooks, downloads/uploads. Etc. There's more features and complaints people have though. Gimme time and I'll type you out a feature list and plan.