I have way too many rigs loaded, it can take a while to go from A to Z.
In browse mode, when you turn the browse knob:
Possibly utizling the page buttons to jump to the next alphabet, ex: if you're on a rig name starting with ""L" press the page left button brings you to "K" or right page button brings you from "L" to "M"
Holding the left page would bring you home to the first rig and holding the right page would send you to the last rig names starting with "Z"