Agreed, someone needs to create an easy "sign up here" with a default option (maybe just randomize across various instances, not sure)

I would say the main improvement could be the available app customization and features. Right now it's very barebones, I can't even find how to sort comments by their upvotes (if someone knows how, let me know), I also can't collapse comments which makes it very hard to go through a lot of replies. I'm using Jerboa currently