Customs and AQIS are flat out staffing the pax lanes, let alone an extra crew lane. You'll be searching your own bag and reading yourself the 'Declare everything' lecture if current trends continue.
IIRC, management in Canberra were against the idea. BNE had an informal crew lane for a while that was stomped on by the fearless leaders as soon as they found out about it.
Lobby the Ministers!
Worrals