Using doc.importIcon in Reader

I am attempting to allow a user to load an image into a button field using Adobe Reader using the doc.importIcon method.

This is being done using javascript for a form built in Adobe Acrobat 8.0, testing with Adobe Reader 9.3.4.

I thought this was possible because the method is marked in the JS API with a red S. According to the documentation, this means that this method should work if any of the following are true:

1) The document is certified and the certificate is trusted by the user and allows high level js execution.
2) The function is called from a menu item and the preference setting Enable Menu Items Javascript Execution is checked.
3) If the menu item function is a trusted function.

I have tried all of these methods and continue to get the error

NotAllowedError: Security settings prevent access to this property or method.
Doc.importIcon

First I placed the following script in a button and then certified the PDF and enabled it to be saved in Reader:

var b = this.getField("pg3.pic1") ;
this.importIcon("image1") ;
b.buttonSetIcon(this.getIcon("image1"));

This worked successfully in Acrobat, but not in Reader even with the trusted certificate.

So then I tried executing it from a menu item, running the item for each page with button fields on it:

function importImage()
{

app.beginPriv() ;

var pn = this.pageNum ;

for (var ifc = 0 ; ifc < this.numFields ; ifc++)
{

if (this.getField(this.getNthFieldName(ifc)).type != "button" && this.getField(this.getNthFieldName(ifc)).page == pn)
{

var b = this.getField(this.getNthFieldName(ifc)) ;
this.importIcon("image") ;
b.buttonSetIcon(this.getIcon("image"));
}
}

app.endPriv() ;
}

app.trustedFunction(importImage) ;

//app.addSubMenu({ cName: "iCiX Standard", cParent: "Tools", nPos: 0 })
app.addMenuItem( {
cUser: "Add Images" ,
cName: "add_image" ,
cParent: "Tools" ,
cExec: "importImage()"
} )

This didn't work using Reader either.

Has anyone successfully used this function in Reader? I checked the latest API documentation and it still claims this should be do-able? Is there an error in my execution? Or am I misunderstanding the documentation?

Any help would be appreciated,
Thanks.