If some here are of the opinion that some "Big" aeroplane pilots barge into the CCT via a SI, without consideration of others in the CCT, that sounds like a whole other issue. Ring their CP and complain.
What a great idea!! Hope things have changed a bit remember Impulse? They used to call downwind 14 miles out, sit on the runway ready to roll for FIVE!!!! minutes, push in anywhere they could. Rang the chief pilot to suggest maybe some of that stuff wasn't good airmanship, his response was to abuse me and say they were "Doing the right thing".
Talking of joining circuit, I was taught the end of the runway is where you join downwind, some call joining extended downwind, some call downwind 4 miles out. While were at it how far out is too far for downwind? I'd say anymore than one mile would be excess even in a big machine?