There are two ways to accomplish what you are trying to do:
Add a Zebra KDU or KDU Plus http://www.zebra.com/us/en/products-services/accessories/keyboards.html The KDU will allow an operator to recall a format stored on the printer. You have to purchase a KDU.
To program the Feed button you will need to create a program that runs on the printer using Zebra BASIC Interpreter (ZBI - http://www.zebra.com/us/en/products-services/software/adapt-software/zebra-basic-interpreter2.html ) This way is more complex and you need to purchase $99 ZBI License to unlock the ZBI functionality on the printer, but with the right program you can get the functionality you are looking for.