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
Deprive the next char of its special meaning (quoting).
|C-h||One char back.|
|C-w||One word back.|
|C-u||Back to the begin of the change on the current line.|