It would be great if there is a way to have containers by company with external list. Think about website specific containers which can share not just their domain's data but of all domains in a list.
Then we can have community supplied list of websites to group them into containers.
For example, we can put gmail, google and youtube by default into one google container to share the login information (you can modify this to have separate containers), but if we open another website, it goes into its own container.
It is a pain creating containers and grouping for everywebsite. If we can share the container grouping as a community, it will make containers very painless.