I just picked up a 4PLS and wanted to know if there's a way to get expo and steering speed to show on the home screen. Whenever I assigned steering speed and expo to a dial on my 3PK, they'd show up on the display.

No, its a set screen with the regular parameters. Page 104, you can only choose Telemetry, Timer, or User.

Bummer, I have no reason to see the ATL value since I don't use it. Oh well.