A couple of questions, what is a FutureIncludingNowValidatorForReadablePartial? And what do you mean with "or a validation through a method". Maybe you could clarify your use-case.

You are also right that we cannot change the behaviour of @Future and @Past now. They are part of the Bean Validation specification. You could also create an issue in BVAL to make sure this request is handled as part of the spec.