I am using odoo 8 to create recurring invoices based on contracts and I just started selling single events through the odoo webshop as well.

Now I am facing the problem that existing customers start buying event tickets. I didn't want my customers to create logins, but right now I end up with multiple customers as every time they buy something through the webshop a new customer is being created. 

If I notice, I can join the customers using "automatic merge", but in order to do so I need to swith to the customer view, search for the customers and so on...

Is there a better way of dealing with duplicates? Would you enable login for your customers?