Multi-Site System 2.x suggestions

Perhaps we can keep suggestions for this add-on here.

My first suggestion is to have an individual user setting for a "default" or "home" site which is automatically set as the url where the user signed up.

This would simplify cronjobs, since you could set a cronjob to run only on the default site.

A good example of this would be Weekly emails of top news. This prevents a user from getting top posts notifications from sites they don't care about, and they can adjust their default site and therefore the news they get at a later time.

There is more than one case when I get emails from domains from sites that I never visit. When I click on these links I get a node structure I didn't expect which leads to confusion.