Link length in layered layout

Assume there are different link types in a graph. when use layered layout algorithm to layout the graph, is it possible to make the length of one link type shorter than the other. It is understandable that the link length can be dynamic, just look for some options when it makes sense to the layout algorithm.

No, there aren’t.
Certainly that wouldn’t make sense in some cases – such as where a link that crossed over a layer was supposed to be shorter than a link between two adjacent layers.