Right now we can set a default Cardtype based on what card a card is plussed with (plus cardtypes).

We'd like to be able to set a default cardtype based on the cardtypes of two cards being plussed together. For example, any user card + any process card would be a user+process card. This would let us use structure to present a form with different aspects of the relationship a person might have with a process (# of times they've used the process, what they think of it, whether/how much facilitation experience they have with it, etc.).

One way of implementing this would be to have the above happen when you create a card "User+Process" - (plussing together the User card and the Process card, each of which are of type cardtype), and set the cardtype of the resulting card to cardtype.

To allow for all possibilities, when you set a plus card (e.g. User+Process) to be of type Cardtype, you could offer two menus:

(any card)                       (any card)
the User card                  the Practice card
any card of type User       any card of type Practice

The last item of each menu would only appear if the card were itself of type cardtype.