I just contacted Credential Direct and I was told:
"If there is an open sell order against a security, then a broker cannot offer them for loan to a short order."
So, if you want to cause a bit of problems for those shorters out there, put in a sell order for 20-30 times current SP. At least some of the manipulators will have issues with shorting.
Perhaps mentioning this at the AGM may be beneficial?