hi Tod to be honest I was asking this question for my brothers visa .
Myself I have a non immigration o visa but I get 90days instead of the 60days bit of a pain really as we are travelling together this time.but interesting about the 30day extension at the immigration office now dose the same apply for the non immigration o visa 30days .?.
Basically I think my brother can go to immigration office get the 30days and then we both leave for Cambodia just before my 90days is up I think that works best ..probably staying