Tcsh's KANJI feature was enabled in tcsh-6.09-6, which was included with RedHat 7.0. As a result, as of RedHat 7.0 or later, it's no longer possible to create key bindings to meta characters (e.g., \377 for backward-delete-word). Given that this is a regression in functionality, and that the majority majority of people will never use tcsh's kanji support, I think that this support should be disabled by default, e.g., by putting "set nokanji" in one of the files in /etc/profile.
KANJI enabling has been removed until a move I18N solution can be found.