I would like to be able to add a link using the WP link manager that will open in a new window. Maybe have a drop-down list or radio buttons that give you this option in the link manager.
It would be great if there were a way to target new tabs, but this is not available. The workaround is to configure your tab-enabled browser so that when you click on a link targeting a new window, it will open not in a new window, but in a new tab instead.
I realize this is for the utterly lazy who don't want to push down an extra button to open pages in a new tab, but what the hey! (as Link Hogthrob would say).