How to set custom properties in Global Security?

Use wsadminlib's method setCustomPropertyOnObject().

Here is the method signature. The parameters are straightforward:

setCustomPropertyOnObject(object_id, propname, propvalue)

The pydoc is pretty good too. If a property with this name does not exist, the method creates it. If one already exists, the method sets the new value.

Here is an example:

sid = getObjectsOfType('Security')[0]
setCustomPropertyOnObject(sid,'andy.propkey','andy.propvalue')
save()

We can then browse to the admin console and see the new custom property in the list.

Extra info:  We can also query the value of a custom property with this method.

getObjectCustomProperty(object_id, propname)