SqlRuleAction to set the ScheduledEnqueueTimeUtc

I would like the set the ScheduledEnqueueTimeUtc of a message with a SqlRuleAction.

This is how I am constructing the Rule on the client.

var client = messageFactory.CreateSubscriptionClient(topicPath, name);
client.AddRule(new RuleDescription()
  {
    Name = "A",
    Action = new SqlRuleAction("SET [sys].ScheduledEnqueueTimeUtc = '4/1/2013 11:01:00 AM'")
  });

It does not seem to work.

I added messages to the topic, and they show up in the subscription before the Scheduled Enqueue Time

Is this functionality supported?