When I create links within the Admin for my site/Blogroll (i.e. not in a post), 99.9 times out of 100 I want the link to open in a new window. Yet, if I forget to set this option it defaults to _none and opens in the same window.
To make it worse, all of the default WordPress links are also set to open in the same window. If I choose to keep these links, I have to edit them all one by one to open in a new window else risk losing visitors.
Please default this setting to "_blank" in the Admin.