555258 Magento Extension / Relaunch

For an upcoming relaunch, we need to import all old urls and content (from a oscommerce related shop) into the new magento shop. So we need a script that fully crawls the old shop, exports URLs and the respective content into a .csv-file (for Magento import data profile), that also contains the fields "request path"(=old urls), "target path", "ID Path" and "Redirect" (all to find at Magento admin > Katalog > URL Rewrite Management). With this file it must be possible to import all old urls and content into the new shop. Additionally it must be possible to set a canonical tag for all pages. We also want to keep our new shop clean, so we dont want the importet content to show up as products, pages or static pages, but as a new type, e.g. "relaunch files" with the ability to manage each of them (e.g. set 301, set canonical, delete, etc.). Who can do that? Or who has a better idea? Please discuss this with me. Thank you