Site indexing and plugin questions

We going to run a multi-site blog network runing across a single domain like Separate blogs sites will be run as folders within this domain so for example, but there will be a root site that we want to use to display posts from across all the other sites.

First question is using the Multisite index plugin how can address index this in the root site index page to display posts from across network? Is there a Shortcode we can use?

Second question is we only want this plugin to be available to the root site how can we hide this from the plugin list for all the other sites in the network? (like /blogSite1 etc).