I've just installed wordpress and enabled multisite.
Using the network wide menu plugin (http://wpmututorials.com/plugins/networkwide-menu/), I've been able to get the primary menu to display on all my sub-sites in the header position - hooray!
Now I'm trying to achieve the same effect in my theme's footer through the four footer widget areas available to me.
I don't believe a plugin exists to achieve this and my google research seems to indicate that it might not be possible to achieve the global menu effect in widgets.
That said, I thought of a possible workaround that I'm hoping to get feedback on.
In the main site I created several custom menu's. I then used the Custom Menu widget to display the menu items in each of the four footer widget areas.
Now here is my idea. I installed the plugin "Linkable Title Html and Php Widget by PepLamb" (http://wordpress.org/extend/plugins/linkable-title-html-and-php-widget/) so that I could hopefully add php code that would retrieve the menu's from the main site. This way if I make changes in the custom menu's they will appear in all the subsites as well.
In my subsites, I used the following code in the widget using the php plugin, which gave me a list of all the pages in my subsite. However, I am looking to have a list of the main site pages I listed in my custom menu in the main site.
<?php wp_nav_menu('show_home=1&exclude=5,9,23&menu_class=page-navi&sort_column=menu_order'); ?>
I'm not sure if there is a way to change some of the code above to retrieve the menu from the main site, but if there is, your help is greatly appreciated.