Flow machines and flow states should display inspector fields for every graph input port of their associated flow graph, if the port has a type with an inspector.
This would allow graph inputs to be used more like behaviour fields in Unity, as a quick configuration for the graph.
In addition, for the sake of organization, a "Category" field should be added to the graph input definition configuration that would group those under headers in the inspector. This category field would have no visual impact when the graph is nested in a super unit.
There are a couple of tricky issues to flesh out to implement this (e.g. how the input literals get stored, if a port gets renamed or removed, what happens of the matching literal, etc.), but the benefit of the feature makes it worth it.
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