[Scribus] pdf-Export: leave colors unchanged

[hans eisl]

Hi,

I have a question to the pdf-Export:
is there a way to leave all the colors in a document unchanged, that 
means export cmyk-colors as cmyk and rgb-colars as rgb?
The reason: we use a high-end digital printer with a higher gamut as 
"normal" 4-color offset-printers and our printer can work well with 
rgb-colors. So it seems sometimes better to import pictures in scribus 
in rgb-colors.
Thanks for your answers.
Hans