Currently extensions are not able to supply the policy system with own limitation lists over class functions because the instanciation is limited to 'kernel/'.

Thats makes it unusable or at least unclean for extensions.

I've attached a patch for 3.7.3. Should fit to newer versions as well. I've introduced a new array value to give the extension. Otherwise it will fallback to kernel for backwards compatibility.

Useage example:

$myLimitationValues = array(
     'name'=> 'MyLimitations',
     'extension' => 'mycoolextension',
     'values'=> array(),
     'path' => 'classes/',
     'file' => 'mycoolclass.php',
     'class' => 'coolclass',
     'function' => 'fetchList',
     'parameter' => array( false )
);

$FunctionList['mymodulefunction'] = array( 'mylimitations' => $myLimitations );

Patching of 3 files was needed because of code duplication.