Curve stroke with dashed-line-option

Cloth objects often need seams, and modelling them in real mesh often is absurd, so most of us create bump maps for that. Blender can draw dashed lines, and it can take curves to draw along, but we can't have dashed lines that get created where we placed a curve before (which would be a graet amount of control over where the seamwill be drawn). I would like to have a functionality similar to what gimp has to offer there.