Relationship app

Ok so I guess I understand how relationships are designed to work in ES. Unfortunately the problem I have is the list of relationships is a little lacking (you don't have civil union, domestic partnership, cohabiting or polyamerous !) It looks like that even though I set the unique key to RELATIONSHIP I probably need to set the relevant answers to something special for this to work? Is there any information on how to get this to work? (ok so I realise polyamerous may be a bit "out there" but others such as civil union and domestic parthership really are suprising to have been missed out.)