I want widgets on the desktop and/or on the lock screen (as a developer api), sideloading applications, some way to store data accessable to any app, a phone number black or whitelist, and a way for users to allow an app to do arbitrary tasks in the background or refuse any app from doing the Apple-allowed tasks in the background. Oh, and keyboards, developers should be allowed to make keyboards.
Then there are a ton of stupid UI issues they have, like when I open a new tab in mobile Safari, I don't want it to gain focus.
I'd like to be able to update the software on it without needing to rearrange apps into the order I want them yet again, I don't have any idea if that is possible or not.