hi avc,
scribus is not a pdf editor.
(well, PDFs are not meant to be edited, either...)
the goal of the pdf importer is to load in the most exactly way an existing PDF and integrate it into the scribus document before the final output.
it also allows to reuse parts of existing PDFs.
but scribus is not a tool to fast load a pdf, do some little changes and save again the pdf.
one day it might become a tool that can manage such a workflow, but it will never be one of the goals of scribus.
and for getting text from a pdf: just select the text in a pdf viewer and copy paste it into a scribus frame...
ciao
a.l.e
p.s.: well, if i must be honest, it already bothers me that scribus can create PDF forms... hey, it's a DTP tool!