Ho do I set up an automation to assign a new ticket to the agent who views?

How do I set up an automation where an agent is automatically assigned as the ticket assignee once they view a ticket?

Context:

Given ZenDesk's lack of case routing technology, support reps must manually view new tickets in the queue and manually assign the ticket to themselves. However, several problems exist with this approach:

• The more simple & less complex tickets are 'cherry-picked' from the queue, which leaves the more complex, and often more urgent tickets, unassigned in the queue for longer (and ZenDesk has no specific reporting that is easy to extract to identify and stop this behaviour) 
• When multiple agents view a ticket, they assume the other is dealing with it, and the ticket stays in the queue, in a new & untouched status, for longer.
• I currently use the automation to 'assign the first responding agent as ticket assignee'; however, when multiple agents are viewing a new ticket at the same time, I've had examples where the customer received numerous responses within seconds of each other from different agents for the same query. 

Enabling automation to auto-assign the agent who views the ticket first would solve all of the above.

On a side note, I'm becoming increasingly frustrated at ZenDesk's lack of, what I deem, basic functionality as a customer support CRM software tool. The above request is only one area gap in what should be a standard setting, including the absence of any usable case routing technology.