Even using the buttons on the TV you can't change settings? I know the remotes are generally useless, but at several hotels now I've been able to change the settings.
Some are certainly more locked-down than others though.
This far into the digital TV era and the aspect ratio is still all kinds of screwed up from channel to channel, at least at the hotels I've been to. At least most of them lately have allowed access to that setting through the menus, though they do of course revert to defaults with each power-up.