in case of a stateful job, there is no need to update trigger state from 'STATE_BLOCKED' to 'SATTE_WAINTING' if the trigger won't fire again.
The code that has to be changed is the following :

- method triggeredJobComplete, class JobStoreSupport :

if (jobDetail.isStateful()) {
    getDelegate().updateTriggerStatesForJobFromOtherState(conn,
        jobDetail.getName(), jobDetail.getGroup(),
        STATE_WAITING, STATE_BLOCKED);
     .....
}

must be replaced by the code :

if (jobDetail.isStateful()) {
    String newState = STATE_COMPLETE;
    if (trigger.getNextFireTime() != null) {
       newState = STATE_WAITING;
    }
    getDelegate().updateTriggerStatesForJobFromOtherState(conn,
        jobDetail.getName(), jobDetail.getGroup(),
        newState, STATE_BLOCKED);
}

regards.