Immersion should be added
I know that Esperanto is still in Beta, but I think there should be an immersion feature because I would enjoy translating articles.
You could create new Wikipedia entries, for example!
The disadvantage is that there is no formal review system where people are encouraged to spend time checking other people's work for linguistic correctness, so people might get annoyed if someone starts producing mountains of bad-quality Esperanto that they feel they have to clean up afterwards without any sort of compensation.
So maybe a blog or something might be better.