You can try, but they'll tell you to make an appointment.
Actually, there will be someone from CBP to interview you as well as someone from the CBSA.
Not sure anything has changed. I believe that the 'wait time' is still a few weeks at airport locations.
Yes and you have to schedule online. You can also do your interview in Seattle if you find yourself there; they usually have a much shorter wait.
1) Is the CBP interview mostly perfunctory?
2) The only places close to the border I plan on being are in BUF and SW Ontario. Basically, IAG/YYZ/BUF are the options. Anyone know which is the fastest?