Idk if this would be a plus or minus, but I think Hal or someone else suggested adding a 3PO line from the radio drama where he refers to Ewoks by name. That may not be necessary though.
This is something that would take new footage with fan-made costumes to pull off but I would love it if when Vader tries to see the Emperor against his command Vader has a short fight with some royal guards guarding the throne room. Vader approaches, they try to use their electro staffs but Vader force chokes and shoves them away. That gives the guards and Vader a bit more to do.