Are you sure? Woulddn't this then allow an inbound pax who is booked through to a domestic destination with Imm/Customs, and is supposed to be in transit, to the change flights to a domestic destination that doesn't have customs/immigration and so enter the country illeagally?

I had thought that transit pax who were going to be cleared at HKT or CNX etc could use the Intl lounge, but were separated from domestic pax until entering the actual departure gate... but I haven't done it myself....