Several clicks? No
Go to Agent panel.
Click on Users.
Click on the user that you want to see the tickets for.
Click on the first ticket.
edit it.
enter the email of the person.
repeat.
or
To to the Agent panel -> Users.
Mouse over or click on the User who has the tickets that you want to move. Get their id=##. (lets say it was 50 for this demo).
Fire up your your favorite DB editor you can do something like:
SELECT default_email_id FROM ost_user WHERE id=50
That should give you a number. The number may in fact match, but do not assume it does with out checking.
REPEAT this for the user that you want to move them to. (for demo sake the user I want to change to is 23, email id 23.)
Then you can do this:
UPDATE ost_ticket SET user_id=23,use_email_id=23 WHERE user_id=50 AND use_email_id=50
