hello again,
i got it to work
the solution was a bit easier after studying the help file from the website so
i inserted the following
cat > %buildroot%{_datadir}/peazip-gtk2/res/altconf.txt <<EOF
[alternative configuration's path: specify a location for conf.txt and bookmarks.txt, using either absolute or relative path (use " and ' if needed); write "same" or let blank to not use an alternative configuration path]
appdata
EOF
So the hidden folder is automatically created while starting the first time.
Thanks for your help dudes
ghostbunny