Of course
I suppose that is possible.
Ask at http://www.pasapoarte.mai.gov.ro.
From my petsonal experience, yes you can cross the passport control with your wife + marriage certificate + your passport + your residence card in romania
Yes, a US resident can travel to Canada.
Yes, as a US permanent resident, you can travel to Canada.
It is not necessary a visa for the citizens of Australia to enter in Romania.
If you are an Irish resident, then there is no need for any identification. If you are from another country you may need a passport and a visa. A driving license is not sufficient as a travel document to enter Northern Ireland.
Yes, permanent residents of Canada can travel to Canada with a valid Permanent Resident Card or Permanent Resident Travel Document.
Yes.
No
Not necessary
yes