Questions about Branding a Multisite install


I've installed Ultimate Branding and it's really great. Thank U guys for the plugin. I have a couple of questions (related to other plugins):

1- I've hidden all the widgets and installed the custom dashboard widget. But it only fills half the dashboard area (see screenshot Is it possible to create another custom widget to fill in the right? Or is it possible to force the widget to fill the 100% of the dashboard?.

2.- Related to the previous, I wanted to install the "Dashboard feeds" plugin to fill the right half of the dashboard with my own feeds. But I've read that the feeds will only be visible in the sub-sites I create after installing the plugin. What happens with the huge amount of sites existing?

Thanks and good work.