WARNING - WARNING. If you currently use the single finger "double-tap select and drag" functionality with your built-in or stand-alone Apple Trackpad, DO NOT check the "Three finger drag" option (System Preferences > Trackpad > Point & Click > Three finger drag). This will forever break the "double-tap select and drag" functionality and you WILL NOT BE ABLE TO GET IT BACK. Once the "Three finger drag" option is checked, un-checking it does NOT restore the "double-tap select and drag" functionality. Also broken will be the range text selection using the single finger double-tap select.