I like the Add new Reference default functionality, being able to add a child record when the parent has not been saved yet.
I would like similar functionality in a process. Something like . . .
ADD NEW REFERENCE child WITH child.parent=parent AND VIEW IN TAB
or
ADD NEW REFERENCE child WITH child.parent=parent USING SomeOtherForm
or the more common
ENTER NEW child WITH child.parent=parent AND VIEW IN TAB