Yes, bits of these themes are worked in here and there, but some of the scenes that lack the weight that they need, IMO, could really benefit from some of the moving and familiar music that we love from the OT.
KOTCS for many of us strays a bit too much from the rough and tumble, thrilling, character rich, dangerous, wonderful OT. If we were to add more of the familiar (not TOO much) into key scenes such as the chase/sword fight scene (current music is TOO light hearted), the Akator discovery (grail theme would be cool here), the mushroom clodu and UFO scenes, etc, it would make the 19 year removed family adventure more so an Indiana Jones Film!
Again, I wouldn't want to over do it, but it would help tie them all together.