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.
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So sorry for the trouble! This is on our list of possible improvements for the future – I can’t say exactly when it’ll be added, but we know it’d be a useful improvement. In the meantime, our apologies for the inconvenience!Akshay Garg commented
I have a group where I have to split 2:1:1 always manually. This is troublesome.