Suggestion: Shape Keys - Preserve Edge Crease

Shape keys allow you to morph from one target to another by moving vertices as long as the model's vertex topology is the same.

Shape Keys however do not appear to preserve any edge information (e.g. edge crease weights).

Shapekeys would be much more useful if they also allowed morphing of edge information in addition to vertex position especially for simpler meshes (i.e. it could remove the need to add additional edge loops to deal with sharper edges).