1.) We dont create users. This is WooCommerce. This code will help, but again, this isnt us, this is WooCommerce. 🙂 https://gist.github.com/bentasm1/71be224e52a24e1b0bb0
2.) The email templates are PHP. As with any PHP template, to add extra fields, add them to the templates code. Pro tip: All vendor related fields are stored in the vendors user_meta.
3.) I believe the BuddyBoss OneSocial Marketplace theme does that, in addition, google Philopress WC Vendors Maps and that is another option.
4.) There’s plenty of built in reports yep.
5.) Some themes (BuddyBoss being one, again) do allow that, yep.