Windows Phone 7.5 Mango features new multi-tasking and fast-app switching that will help you quickly switch between recent applications as well as allow certain things to keep running in the background. While there is a spot in the settings for you to selectively choose which apps can run in the background, these new features could still affect your battery life. XDA-Developers user “GoodDayToDie” has decided to make a home-brew Mango app that toggles the multitasking features on and off. It should work on most LG, Samsung, and HTC Windows Phone 7 devices as long as they are developer unlocked and configured for Mango homebrew. You’ll need it to be delevoper unlocked anyway so that you can sideload the app that’s downloadable from the original XDA-Developers thread. The app also features a live tile for instant enabling or disabling of multitask features.