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?