[kh99]

You could use an "additional" usergroup to add the extra permissions. (In the Paid Subscription Manager, set the Primary Usergroup dropdown to "No Change" and check the box next to the "Additional Usergroup"). You would also need to make sure that the "Allow Users to have Member Groups" setting (in the Usergroup Manager) is set to Yes for the user's main usergroup.

The way the additional usergroups add permissions is that a user will have the greatest permission allowed by any group they belong to, which means "Yes" overrides "No", and a higher number overrides a lower number (unless '0' means something like 'no limit', then the 0 will apply).

I suppose you could also just give your staff usergroups all the permissions and tell them not to buy any subscriptions.