viper-no-multiple-ESC

viper-no-multiple-ESC is a variable defined in `viper-keym.el'.
Its value is

t

Documentation:
If true, multiple ESC in Vi mode will cause bell to ring.
This is set to t on a windowing terminal and to 'twice on a dumb
terminal (unless the user level is 1, 2, or 5). On a dumb terminal, this
enables cursor keys and is generally more convenient, as terminals usually
don't have a convenient Meta key.
Setting viper-no-multiple-ESC to nil will allow as many multiple ESC,
as is allowed by the major mode in effect.

You can customize this variable.