Currently it is possible to set a result spec for a flow node AnalysisSequenceCapabilityNode.setResultSpec(). But it seems that this feature is never supported in UIMA 2.x. We should either remove/deprecate this APIs if this is really true that it is never supported.
But I think that this was a very important feature for search engine integrations, so I would vote for adding this functionality again to the FlowController stuff. Let's start the discussion on how this can be done and what we will do for UIMA 2.2.