Ok it s suggestion but i will find it handy. it would be to create a node in the compositor that will get only an input and an output. it will do absolutely nothing exept that you could name it.
The idea would be to use this node when grouping, so as to name input and output clearly. that will simplified node exchange and utilisation.
at the moment this is not available and no api is planned - dosnt mean we shouldnt have it - but its low priority.