viper-vi-state-mode-list

viper-vi-state-mode-list is a variable defined in `viper.el'.
Its value is

(fundamental-mode makefile-mode awk-mode m4-mode xrdb-mode winmgr-mode autoconf-mode cvs-edit-mode html-mode html-helper-mode emacs-lisp-mode lisp-mode lisp-interaction-mode jde-mode java-mode cc-mode c-mode c++-mode objc-mode fortran-mode f90-mode basic-mode bat-mode asm-mode prolog-mode flora-mode sql-mode text-mode indented-text-mode tex-mode latex-mode bibtex-mode ps-mode diff-mode idl-mode perl-mode cperl-mode javascript-mode tcl-mode python-mode sh-mode ksh-mode csh-mode gnus-article-mode mh-show-mode)

Documentation:
Major modes that require Vi command state.

You can customize this variable.