Subject says it all, in 2.0 Final if you have a Sony Stalk, the next/previous buttons should navigate menus in the player.
This used to work but in the early 2.0 betas but has been broken for a while.
It still looks that way.
BTW: The release notes did not say it was fixed but I recall this being commented on recently as something that had been fixed.

Workaround is to use IR translation to map Stalk next/previous in MENU mode only to Left/Right buttons.