generic operator menu was searching for "type" and using the first enum property if it wasnt found.

this is too arbitrary and could break if roperty order is changed.
store the property in the operator type that is to be used for menu and enum search func's.

python function for searching operator enums on invoke. (just need dynamic python enums now)
 wm.invoke_search_popup(self)

source/blender/python/intern/bpy_rna.c

@@ -4011,6 +4011,9 @@ int pyrna_deferred_register_props(StructRNA *srna, PyObject *class_dict)
 
 	order= PyDict_GetItemString(class_dict, "order");
 
+	if(order==NULL)
+		PyErr_Clear();
+
 	if(order && PyList_Check(order)) {
 		for(pos= 0; pos<PyList_GET_SIZE(order); pos++) {
 			key= PyList_GET_ITEM(order, pos);