I guess something like this may allow data passing to callback:

diff --git a/include/v8.h b/include/v8.h
index 171623a..afeb043 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4322,7 +4322,8 @@ enum AccessType {
  * object.
  */
 typedef bool (*AccessCheckCallback)(Local<Context> accessing_context,
-                                    Local<Object> accessed_object);
+                                    Local<Object> accessed_object,
+                                    Local<Value> data = Local<Value>());
 
 
 /**
diff --git a/src/isolate.cc b/src/isolate.cc
index 40d4c9f..2d15420 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -843,7 +843,8 @@ bool Isolate::MayAccess(Handle<Context> 
accessing_context,
     VMState<EXTERNAL> state(this);
     if (callback) {
       return callback(v8::Utils::ToLocal(accessing_context),
-                      v8::Utils::ToLocal(receiver));
+                      v8::Utils::ToLocal(receiver),
+                      v8::Utils::ToLocal(data));
     }
     Handle<Object> key = factory()->undefined_value();
     return named_callback(v8::Utils::ToLocal(receiver), v8::Utils::ToLocal(
key),


didn't tried it yet, but is idea correct or there was some other reason to 
drop data?

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