Query parameters drop down type: Ability to use BO's

When in customization of a form, we can add an EpiCombo linked to a BO say Customers and it would show a list of customers…

But I want to show the same in a drop down combo parameter list in a BAQ, and this is not possible. I have to create another BAQ, listing the customers, and use that BAQ as the source of my combo.

It would be nice if we could have access to the same “design” objects as in the customization…or at minimum the ability to re-use what is already available for such simple lists…

Pierre