That is cool! I just tested the middle mouse panning in the graph editor, it works great!
Just an additional request that may be relevant to this post.
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Also add Middle Mouse Panning options to the ff:
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Texture Editor
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Level Sequencer
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Timeline Node (Created via Blueprints)
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Curve Editor
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Oddly, this one has Left Mouse Button for panning.
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This is the Curve tab found in Particle Editor (Cascade)
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Widget Blueprint
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Currently has Middle Mouse Panning by default, which is great! But the Right Mouse Button is also doing the same thing.
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So an option to disable the Right Mouse Button Panning would be handy.
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Maybe just add the same Panning Mouse Buttons options for all the Editors?

So far these are just the editors that I encountered that may need MMB panning. (I haven’t fully used all the areas of UE4)