Pablo please please please don't start modifying brushes to fit your need, since people like me might use the same brush for another purpose that you don't know ( sometimes i use this brush and i want that weird deformation, and let my imagination fly and make something out of that mess) . Instead make a new brush that will coexist with the old one and everybody can still use the brush that fits their needs. I don't have to explain to you that digital sculpting is about the feeling of the brush not the mathematics behind it.

@Erick Tukuniata (erickblender) What you are seeing in the video is clearly a bug, so it needs to be fixed. Using a sharper falloff may be personal preference, but you can still tweak the rest of the defaults.