Move the export_product wizard to a dedicated module "base_sale_export_product". The goal of this modification is to have fewer options (so less potential errors) for users that only import from the webshop to OpenERP and never export from OpenERP to the webshop.
Add a module "base_sale_export_partner" that has the same functionnality as the "base_sale_export_product" but for partners instead of products.