What does "dpkg-reconfigure keyboard-configuration" actually do?

Is it possible to script what dpkg-reconfigure keyboard-configuration actually do?

I always make the same selections, so it would be very nice, if I could do it without any user interaction.

Seed your options with debconf and run DEBIAN_FRONTEND=noninteractive dpkg-reconfigure keyboard-configuration.

man debconf-set-selections(1):

NAME
       debconf-set-selections - insert new default values into the debconf database

SYNOPSIS
        debconf-set-selections file
        debconf-get-selections | ssh newhost debconf-set-selections

This shows your current settings:

$ debconf-show keyboard-configuration
  keyboard-configuration/modelcode: pc105
  keyboard-configuration/unsupported_config_options: true
  keyboard-configuration/unsupported_config_layout: true
  keyboard-configuration/toggle: No toggling
  ....