Auto Creation of CustomerID to match Customer User?

I've just made the long trek from version 3.3.6 to 6.0.15. 

I love the new version's GUI improvements and much of the new
functionality, not all of which I've figured out yet! 

In particular the Customer / CustomerUser relationship is giving me
trouble. I think I understand it (that CustomerID is a "company" or
"group" of CustomerUsers). Since we don't need that functionality, (we
are "B2C", not "B2B") I have: 

 	* CustomerCompanySupport => 0,

in my Config.pm. 

In 3.3 when a new/potential customer emailed into our main "info" queue,
we would: 

 	* copy the customer's email address 
 	* select "Customer" from the menu
 	* Paste the email into both the "CustomerID" and "CustomerUser" input
fields

This worked as expected; all the customer's tickets could be found
searching by email. 

However, now in the "People-Customer" menu popup we can only paste the
new email address into Customer User; the CustomerID field is disabled
and since the pasted email is new, no Customer ID is available. 

My Question: 

Is there a way to avoid manually creating a CustomerID / CustomerUser
pair for each new client? 

I'm fairly sure I'm missing something obvious, but I've spend the last 3
days searching docs, playing with Config.pm, examining the data in
ticket & customer_user tables, etc., and I have failed to get it to work
as desired.  

I look forward to any help you can give! 

Thank you in advance, 

MikeM

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