I'm not familiar with the "export" file browser. In konqueror you can save a profile. Select the "Save Window Size with Profile Button".
The you can duplicate the konqueor menu item and change the command from
kfmclient openProfile filemanagement
kfmclient openProfile <your_profile_name>
Often you can launch a gui program in the console and enter the --help option to learn options that you can add to the command entry for an gui shortcut or menu item:
did you know that you can convert pdf files to postscript files in the console using acroread!
-toPostScript [options] -pairs pdf_file_1 ps_file_1 ...
It has many more options, such as exporting only odd pages, reverse order, etc.