I moved all my defaults write commands from the readme into my boxen config. Pretty nice :)

ossettings.pp

class projects::ossettings {
  # directory setup
  $home = "/Users/${::boxen_user}/"

  ## java home
  file_line { 'java_home':
    path => "${home}/.profile",
    line => 'export JAVA_HOME=`/usr/libexec/java_home`',
  }

  ## ssh-agent timeout of 10 minutes:
  property_list_key { 'ssh_agent_timeout':
      ensure     => present,
      path       => '/System/Library/LaunchAgents/org.openbsd.ssh-agent.plist',
      key        => 'ProgramArguments',
      value      => ['/usr/bin/ssh-agent', '-l', '-t', 600],
      value_type => 'array',
  }

  ## one-shot defaults-write settings:
  osx::recovery_message {
    'If this Mac is found, please contact me at +31 6 [redacted] or [name]@[domain]':
  }

  # print/save dialog
  include osx::global::expand_print_dialog
  include osx::global::expand_save_dialog

  include osx::global::disable_key_press_and_hold
  include osx::dock::autohide

  include osx::finder::enable_quicklook_text_selection

  include osx::no_network_dsstores
  include osx::keyboard::capslock_to_control

  # keyboard
  include osx::global::key_repeat_rate
  include osx::global::key_repeat_delay
  # the default value (35) is definitely low enough.

  # mouse
  class {'osx::mouse::button_mode':
    mode => 2,
  }

  # UI:
  class {'osx::mouse::swipe_between_pages':
    enabled => true
  }

  # subpixel rendering
  boxen::osx_defaults { 'Font smoothing on external display':
      key     => 'AppleFontSmoothing',
      domain  => 'NSGlobalDomain',
      value   => '2',
      type    => 'int',
  }
}