Two adapters with the same object class in UNIFYBroker 5

I am migrating an Identity Broker 4 customer to UNIFYBroker 5, and they have two MIM-consumed adapters using the same object class "person".  UNIFYBroker 5 won't let me configure two adapters with the same object class, even is single schema mode is disabled.

Is this something that could be changed, to allow me to use the same object class on two adapters?  The object classes are hard-coded in the customer's MIM rules extensions, so it is preferable to keep them unchanged the way they were in Identity Broker 4.