Using ecommerce for offline stores

Hi,
I am running an online store with ecommerce, but like to use it also for customers that go to our offices. It will be easy for a user with admin privileges to add a new user to the site (with the data provided by the customer), and even to add an address to its addressbook.

My cuestion is, ¿is there a way to add an order to that user from the admin account?. I know that login as that user will allow to add orders directly, but it would be complicated loggin/logout from admin to other users all the time.

¿is it possible to do this directly from the admin account?

Thanks