By 'pictorial' use I mean a use of the film that is intended for full grayscale printing. Traditionally, Technical pan was a very high contrast film, brilliant for use in astrophotography for its extremely high resolving power and incredible reciprocity characteristics. But mostly its high contrast prohibited use of the film in traditional work with lots of grayscale in between full white and full black.
But some people learned how to use the film that way anyway, more or less successfully. My dad used it with Rodinal at 1+200 dilution with wonderful results. You used Tetenal Doku, and there seems to be other developers that will allow you to produce a full tonal scale from this high contrast film.