This replaces the rather annoying default application selector we have in Jelly Bean with one that you just tap on the icon once to launch the app, and select a checkbox beforehand if you want it to be the default app. Since this, thanks to Xposed, works on a global level, it replaces all of the default application selector dialogs, regardless of Intent.
This Xposed module is based on Zaphod-Beeblebrox's work on originally including this feature for the AOKP ROM.