Cross-post from http://drupal.org/node/1773702
Below is the list of variables which are supported by domain configuration, domain settings and domain theme. Most of them are already provided by the variable module and can be managed with the domain variable module, some others still need work.
Variables which are supported:
site_name, #1593558: Support site_name variable
language_default, #1593494: Support language_default variable
theme_settings, #1593520: Support theme_settings variable(s)
Variables which are not yet supported:
menu_options_[type], see #1601950-2: Add support for content type settings forms.
menu_parent_[type], see #1601950-2: Add support for content type settings forms.
color_[theme]_*, #1595880: Support color module variables
Other differences/related issues: