Custom style for \listplot or \dataplot

Question

Is it possible to make custom style for \listplot and friends? By default they support only plotstyle=curve, line, bezier, and I need to use bspline from pst-bspline package.

\documentclass[a4paper,14pt]{scrartcl}
\usepackage{pst-plot,pst-func,pstricks-add,pst-eps}
\pagestyle{empty}
\usepackage{filecontents}
\begin{filecontents}{data1.dat}
256.4912 0.0674
259.7543 0.0904
264.7287 0.0502
270.1739 0.0339
276.2696 0.0531
281.4192 0.0402
284.4351 -0.1221
286.7098 -0.2659
289.9052 -0.8337
292.8813 -1.391
295.1299 -1.3968
297.858 -1.8959
299.5145 -0.608
302.1028 -0.323
\end{filecontents}
\begin{document}
\readdata{\foo}{data1.dat}
\begin{psgraph}
[axesstyle=frame,ticksize=6pt,subticks=5,Ox=250,Dx=10,Oy=-2,](250,-2)(310,0.2){0.8\linewidth}{0.6\linewidth}
\listplot[plotstyle=dots,linecolor=blue,linewidth=0.5pt,showpoints=true]{\foo}
\listplot[plotstyle=bezier,linecolor=red,linewidth=0.5pt,showpoints=false]{\foo}
 \end{psgraph}
\end{document}