I should be able to construct a Model Value in code

(User Story, Investigate , Priority: Medium, Test Status: No automated tests yet , Reported By Justin du Coeur, )
QL, Model Types
Summary: This is the thin end of a wedge, but I really want to be able to specify, eg, a Duration of 2 years inline in the Carolingian Officers' Space. At the moment, I have to construct pointless Things just to hold values that I am using in code.
This should probably be solved in a general way. This might actually be motivation for the equivalent of the "new" keyword in most languages, or of a case class constructor in Scala. The syntax is not obvious, since the Properties of a Model Type don't have an order, but something along the lines of Duration(quantity=2, unit=years) would be a start.