I use the apps Strides and Pennies religiously. Pennies to track money spent in my budgets, and Strides for all other daily metrics.

I would love Strides to have the same abilities to quickly and easily categorize transactions as Pennies, then I could ditch the other app and use Strides for everything.

The budget feature in Strides is already good, but making the ease-of-entry for adding transaction quick with pre-defined (and editable) transaction categories would be a game changer.

It would personally make me use the app more, and I would pay more for this feature.