viper-allow-multiline-replace-regions

viper-allow-multiline-replace-regions is a variable defined in `viper-init.el'.
Its value is

t

Documentation:
If non-nil, Viper will allow multi-line replace regions.
This is an extension to standard Vi.
If nil, commands that attempt to replace text spanning multiple lines first
delete the text being replaced, as in standard Vi.

You can customize this variable.