Allow more than 1 point of sale item to be added at one time

We have different prices for recital tickets so each ticket is a separate point of sale item plus we sell recital t-shirts. If a customer is buying all of these items, we have to add each item individually to the sale which takes time going back and forth. It would be nice to select all items being purchased and then click Add so that all items are added to the sale at one time.