As I promised to check back in giving a feedback of my experiences, I am just sitting at JNB airport (BA lounge) starting my DONE5 with a CX flight to HKG.

I have done booking through the CX office in JNB. Has not been too straightforward (no comparison to the dedicated AA desk), but reasonable. You have to send in the itinirary by E-mail, call or E-mail a couple of times until they get all things straight, and then pay by CC (fax form with copy of CC and passport...).

I had to pick up a paper ticket at the airport, as I have a KA-segment to DAC which apparently cannot be booked on an e-ticket. I thought that all OW flights would be e-ticketable???