I really like this plugin. I had worked up pseudo breadcrumbs that work for multisite and a bunch of buddypress stuff but it was real messy. I'm glad someone put it in a plugin. Just a couple things I found.
When activated sitewide the options don't let you save on individual sites admin side.
How to get crumbs working on plugin components like achievements
Pagination needs formatting. Home>>Blog>>APagePage2 should be Home>>Blog>>APage>>Page 2
How to extend it to display on gallery/attachment pages.