Actually, the new setIgnore() method allow to not send the sampleResut to all listener. 
But you have to set the propertie in the sampler, you can't change it on a post-processor or in a assertion script. 

I think it could be usefull to allow this behaviour. 

Actually, I check in a assertion script if a JMS subscriber sampler got a 404 as code result ( i.e timeout , no message in the queue, but it's just a purge thread group, so I don't care) and I rly don't want to pollute my result with this.

For me, we just need to check the ignore status before send to listener result like this =>

runPostProcessors(pack.getPostProcessors());
checkAssertions(pack.getAssertions(), result, threadContext);
if ( !result.isIgnore() ) {
   // Do not send subsamples to listeners which receive the transaction sample
   List<SampleListener> sampleListeners = getSampleListeners(pack, transactionPack, transactionSampler);
   notifyListeners(sampleListeners, result);
}