Minibuffer can be edited similarly to Insert state, and you can switch
between Insert/Replace/Vi states at will.
Some users prefer plain Emacs feel in the minibuffer. To this end, set
viper-vi-style-in-minibuffer
to nil
.
Deprive the next char of its special meaning (quoting).
One char back.
One word back.
Back to the begin of the change on the current line.