After many unwanted deletion of expenses sheet, bin for expenses sheets has finally been implemented. It is now impossible for users to delete directly an expenses sheet: the sheet is marked as deleted and automatically destroyed 30 days after its last edition, unless the user recovers it before. The action of deleting is now more coherent with other actions as it is undoable.
The first feedback I got about the α.3.0 new look was that it was not easy to find the lists of expenses and not very readable because of the font. So I reverted the UI's skin and put all the lists of expenses, spreadsheets and debts together! I'm not sure if it's judicious. The interface seems too loaded. However everything is at one click, and it'd be easy to move expenses from one list to another, simply by drag-n-drop.