Open one contact with 2 whatsapp number+message read on media button pressed

Hello.
I've just installed Touchless Chat and I'm seeing that those contacts for whom I saved two mobile numbers (in the same contact) and which both of those numbers are also Whatsapp numbers, for those contacts I can't choose Whatsapp as default app.
Is it right or is there a way for doing it?
Another thing: when I receive a message I want it to be read only when I press the media button of my earplug. Is this possible or touchless chat read it only straight away?
Thanks.
Luigi.

 

Another thing.
How do I send whatsapp messages to groups? These groups are not in my contact lists...
Thanks.
Luigi.