I think a good idea going forward would be the possibility to be able to split one transaction between two or more categories. For example, if I visited Tesco my app would default to the groceries category but lets say I bought some sun cream (holidays) and some paracetamol (personal care) as well as my regular food shopping it would be great to be able to split the single transaction between these three categories to give a better overview.
Merged with existing idea