Hopefully i dont overlooked this topic.
Mean Crease = e.g. red
Sharp Edges = e.g. yellow
and the Seams = dashed line
Blend the Mean Crease and the sharp Edge Colors togehter to Orange (in this scenario).
On top of them, the dashed Line of the Seam.
This Way it would be clear at the first glance, wich modifications are applied to the Edge.