Dancing terrain shadows - Any fix ?

I find the terrain shadows really fantastic in P3D when you are talking about large objects (i.e. mountains, hills, etc.).  The problem is when you are taking about smaller objects like manmade warfs, berms, sea walls / breakers, and even the low land next to rivers and islands.  these object just have this awful dancing shadow that looks terrible in the sim.  Anyone know how to eliminate these but keep the large object shadows ?