I had this conversation with layz once, in a different context, over 507. Gate A7 is generally international, but it can do domestic since it decants in between the two double doors separating domestic and international. It's the gate on the northeast corner of the building. However it needs staffing to ensure no one goes the wrong way at the top of the jetty, and in reality it only becomes a domestic late at night or first flight in of the the morning. However I actually think this is so geeky that many (most?) T5 ops people don't know this, most crew certainly don't, I'm often telling the CSD or captain how offloading works at certain gates.

However with a bit of jiggery pokery gate 7 would be ideal for 767s (and I assume it's ok to onboard both domestic and foreign from that gate, can't remember a domestic departure from there).