Users on Economics.SE (where I am a pro tem moderator) have raised the issue that they are not able to specify which alternative sites within the SE network would be suitable when voting to close a question as belonging on another site.
As I understand it, we can have a maximum of four sites for users to choose from. The list here reveals, in particular, that Money.SE receives a constant trickle of questions from Economics.SE. But how can we arrange for Money.SE to be added to the list close for migration targets?