So are we talking about hair interpolation? We don't have a tool to do exactly this, but if we are talking about hair and guide interpolation you can play with the Interpolation Space and Interpolation Guide Count sections in HairFromGuides to smooth the hair. Interpolation Count takes 1 to 3 guides and average the hair between them, just as a described.
Jeordanis Figuereo (Product Designer. EPHERE Inc.)