As of September 2016, we don’t currently have any plans to add features for charging interest. We can definitely see how it’d be useful in some circumstances, especially for large debts, but right now we think it would add too much complexity and require us to redesign some significant parts of our user experience.Bhaskar commented
I can see how this would be a huge help for people who have many friends with the same name who refuse to add their last name to their accounts! This isn’t on our roadmap yet, but it’s something we’ll consider in the future.
We aren’t planing to add support for custom categories in the near future. We’re considering better ways to allow people to sort expenses into categories other than the ones we’ve provided. In the meantime, if there are particular important categories you feel are missing, feel free to email us with a suggestion at email@example.com.