I know it's a bit late, but I came in on the 2nd June and asked for the 60 day, imm guy said not yet, what do you want, so I said 30 days.
Also, I didn't need to purchase a return ticket as the airline didn't ask to show it.
Also that yellow book you get after your Thai identity card came in handy at the motor transport place, paying yearly road tax and registration check.
Because I just had a Tourist entry stamp they were hesitant about re-registering my car until I produced the yellow book.
My O extension expired while I was away