Here's a silly thought. Instead of scrolling through the list, why not type in the ICAO code using your keyboard? I tried it and it worked.

Well, that wasn't the question he was asking about. He wanted to know how to scroll through a list such as Nearest Airport, Nearest VOR, etc. where the "keyboard entry" isn't applicable...

If wanting to look up a specific airport or navaid, then use the Waypoint Page(s) and the keyboard to enter the ICAO.
Same procedure with the DirectTo Page. Click center knob to enable flashing cursor, click once on inner knob - mouse area to select the first letter, then type in the ICAO with the keyboard. 8)