Events rather than bills
It would be easier if you added an "events" category, for situations when several persons pay for the same event.
In my case, we hold several times a week big dinners in a shared household. Let's say we are 10 having dinner, I'll go groceries shopping for 40 €, my friend Paul will buy bread for 4 € and my friend Sarah will buy meat at the butcher's for 60 €. Right now, I need to add three bills for one single dinner, copying each time the same information about participants and number of shares. I'dd much rather add an event "dinner on the 3rd of November", list of participants and number of shares for each one, and three persons payed this much.
Thanks for your otherwise very nice app !
P.M.

We’re about to make some big changes when it comes to how groups interact with our one on one friendships. These changes will help ease the pain of the situation you’re describing.
I think that being able to tag things (like this dinner) without having to create a group or add it 3 times would be great.