When inserting links into custom emails, the default option for "Open link in..." is "Current window" which means an extra 2 clicks to change it to "New window." New window is far and away the better option—no one wants to click a link in a newsletter they're reading only to be taken away from that newsletter and have to use the back buttons to go back to it—so it should be the default option OR there should be a way for users to choose which option is our default.