Using EJB 3 TimerService with JBoss AS 7.1.1.Final?

I am writing an application to allow end-users to schedule various administrative tasks. The server platform I'm on is JBoss AS 7.1.1 Final and EJB 3 Timers would seem to be a nearly ideal solution, except that this question, while old, indicates that 7.1.1 has an incomplete implementation with no database persistence (in spite of this code I saw for 4.0.2).

What do I need to do in order to implement database-persisted EJB timers in JBoss? Do I need to upgrade JBoss or can it be done without implementing the entire framework myself?