When specifying the Blueprints to add, besides price I would also want to specify the date. This would be very convenient for adding travel expenses, since we often only add them some time after the trip when all credit card statements etc. are available. As is now, we have to open every single item we added via Blueprints, to adjust the date. Kind of defeats the purpose of Blueprints, doesn't it?
Should you ever consider adding a location attribute (as requested here: http://support.oranged.net/entries/23573582-Add-location-attribute-to-work-items), please don't forget to add that as well for adding work items via Blueprints.