Every airline at S.I.T. and I would safely say around the country in the least, have all transits/PREFLTS conducted by LAME's.
Jetstar and Virgin don't for their domestic operation, they do daily's. Etops preflights being the exception. Only need to call an engineer out if there is a problem, last time I looked their OTP was pretty close to Qantas.
Even I as a worker for Qantas can see the writing on the wall in this area.