"Freehand" Sculpting, advice?

[Baenlynn]

I'm tweaking an existing model with a lot of surfaces/vertices, stretching some parts and shrinking others, I am just wondering if there's an option somewhere to enable surfaces and/or vertices adjacent to my selection to be dragged along with my selection, just to a lesser degree. The 'smooth shape' function definitely helps, but if there was a way to dynamically deform the parts of the model surrounding my selection it would speed up the process considerably.

Any tutorial or plugin suggestions would be welcome.