Right align header's custom menu, when in RTL mode
theme/fusion/style/menu_dropdown.css
theme/fusion/style/menu_rtl.css
theme/fusion/config.php
theme/fusion/renderers.php
theme/fusion/pix/menu/*

Right align header, When in RTL mode
theme/fusion/style/core.css

Change $bodyclasses[] = 'has_custom_menu' to 'has-custom-menu' , on all themes (for consistency with other css class names)
theme/fusion/layout/frontpage.php
theme/fusion/layout/general.php