Please have a look at the following test case: https://anonsvn.jboss.org/repos/jbpm/jbpm4/trunk/test-db/src/test/java/org/jbpm/test/timer/TimerTest.java
At the end there is an example of using timers with event listeners, I just don't know if that was available for 4.3 or was added in 4.4 but I think worth looking at it.
P.S.
Please ignore my previous post, it was submitted to fast.