viper-always

viper-always is a variable defined in `viper.el'.
Its value is

t

Documentation:
Non-nil means, arrange for vi-state to be a default when appropriate.
This is different from `viper-mode' variable in that `viper-mode' determines
whether to use Viper in the first place, while `viper-always', if nil, lets
user decide when to invoke Viper in a major mode.

You can customize this variable.