I can see if I can add any light on this interesting index-here we go
The 1st South Australian Mounted Rifles had all returned before the end of 1900 so no extra clasp roll.
The majority of the 2nd had also returned but a few stayed behind and received the 01 clasp- the really interesting ones are the handful of these who came back to Australia and then returnedwith the Aust Commonwealth Horse and also gained the 02 bar giving them a 7 clasp medal.
In 40 years of studying South Australian QSA'S I have never sighted a genuine one, the closest I got was-in about 1980 I was shown a 7 bar by an Adelaide dealer named to Skinner-I didn't like what I saw as the medal was named with what looked like punch pricks and later research revealed that Skinner in fact got a QSA/KSA.
The remainder of the the South Australian Contingents all had service into 1901/02 hence the need for extra clasp rolls-at one stage I owned the microfilms that you could buy from the National Archives at Kew for all the Australian contingents-if I remember correctly they were very reasonably priced at the time.
Hope this helps