I agree with Billy,
This is a HUGE problem for my clients as well. We are on a plus plan and it is ridiculous that we cannot place orders for our clients without asking for their CC each time.. you should be more forthcoming with all of your stores that need to service B2B because Shopify is NOTTT the right platform for this. I wish I had known more before moving a client of mine to Plus that the system is not right for B2B on any level.
Shopify needs to find a way to support businesses like this.
If there is an app that would be amazing otherwise please add me to the list of people who need this functionality.