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Yes. I would be glad to see functionality like this in Magento too. For example by managing permissions roles in the admin panel. It would be really nice idea to limit access per website, store or even store view. And also limit catalog access (per categories).. and so on
You can try Advanced Permissions extension. You can assign an admin to particular products, catalog or store-view. This way he will only have access to the products and stores that he is in charge of and not to the others. You can also easily restrict access to admin panel, CMS pages and and specific data.