Nothing special, but it comes in handy from time to time.

int   reverse_normal = chi("reverse_normal");  // toggle
float distance       = chf("distance");        // 0.5 in 0.0 to 1.0
int   segments       = chi("segments");        // 1 in 1 to 10
float normal_mult    = 1;

if ( reverse_normal == 1 )
    normal_mult = -1;

int    vertices [] = primvertices(0, @primnum);
int    vertex      = vertices[-1];
int    point       = vertexpoint(0, vertex);

vector pos = vertex(0, "P", vertex);
vector nor = point(0, "N", point);

for (int i = 1; i < segments+1; i++)
{
    float  dist    = distance / float(segments);
    vector offset  = i * dist * normal_mult * nor;
    int    ptnum   = addpoint (0, pos + offset);
    int    vertnum = addvertex (0, @primnum, ptnum);
}