There are several functions that are available from the rental browse screen.
(Bottom of Rentals Browse Screen)
Duplicate Inventory and Replicate Inventory are 2 ways to add new titles very quickly.
The Artists button lets you add movie stars, directors, etc. to your titles.
Rent to Sale lets you transfer a rental item to a sale item, although you can to that from POS Screen 2.
Using the Rental Wizard can speed up entering inventory. It is used in conjunction with the Memorize Tools Button.