For business trips, I always set the dates of the expense items (flight, hotel, asf.) to the same day for a given trip. When I create items (whether manually or via blueprints), the date always defaults to today. For travel, I can however only enter the data after the trip is finished, because only then I have all the invoices etc, to know the exchange rates, credit card foreign use surcharges, etc. I.e. the dates of the work & expense items are in the past more often than not.
It would hence be a huge improvement for my workflow, if I could select several work & expense items, and find a "Change date..." option in the contextual right-click menu, which would open a date picker for me.