I've been using these features for years thinking that all sellers were using them. But in a meeting yesterday, I discovered that only senior staff had access to these features. So that has been mended as of today.
So all sellers should see, at the bottom of their thread where they are selling something, two important links:
The first is straightforward. Please let me know if there are any issues. But it is the second where sellers have new access. Click on "product ledger" and scroll to the bottom. This is where, for kickstarters, I go to hand things out by the thousand. I paste in a few thousand email addresses and click on "add all" - easy peasy. And if I need to give somebody access for any other reason, all I need is their email address and the system takes care of everything.