Add functionality to shared tabs (like splitwise) to share a bill between any members of the tab (i.e., excluding some if needed), using % splits (customisable each time) or predefined amounts and then splits of the rest etc
This is already possible: you can set someone’s share to “£0” (alternatively you can click the “Edit” button in the top right when you are selecting how much someone owes then remove them from the split, but this just sets the value split with them to £0 anyway).
I agree that this would be useful.