@chaley,
Speaking only for myself, I don't have a burning need for any of those things. However, as you're looking for opinions ...
re: 1 - As I've mentioned previously, I can see why 6 wouldn't be enough for some users, especially if they've been using the Moon+ list widget which allows many more than 6 (but I've no idea what its limit is, if any).
re: 2 & 3 - Just a comment, you could actually do this already with a bunch of CC shortcuts.
Once you've officially released these 'first efforts' might you get a lot more suggestions about what 'new improved' versions could/should offer?
Other than my first comment above, I don't see that your 'first efforts' as-is are lacking anything compared to existing offerings in the popular Android reading apps. The fact that CC will provide a 'Recently opened list' across
all reading apps will give it something no other app currently offers.