While with the implementation of the Bump Height parameter, the bump map scaling issue was solved, the parameter itself creates some new questions. Maybe the devs can clear the math up a bit for us so we can decide how to best set the parameters.
Somehow the Bump Height parameter seems to influence the crispness of the input texture. This is both visible in procedural textures as well as image-based ones. Below are two examples. One of a Noise texture used as a bump map and one using an image texture. On the left, the Bump Height value is set to "0.001" and the Multiply node before the Bump input socket is set to 10. On the right, the Bump Height value is set to "0.01" (10x the value as the other material) while there's no Multiply node used here. As you can see, the bump effects on the multiplied textures are much more detailed. So a bit of insight would be nice here.