ANSA,
Hong Kong CLK had 2 ADC(arrivals and departures) 2 GMC (North and South) 1 Clearance Delivery(data link clearance to some operators),1 Tower co-ordinator(multi tasking).It also had a zone control and sector which was a FIS to traffic outside the zone.These positions were often band-boxed onto Tower co-ordinator.The supervisor did some breaks,but not that many as they were Cantonise fluent,and took most of the external calls.Obviously positions were band-boxed at night etc.
We did up to 800 per 24hr on that combination (I left in 2001),but it is certainly more nowadays.
You need any bodies with parallel runway experience?