Since I couldn't get my Xiaomi Mi2S to connect to the ADB debugger on Windows 7 x64, I had to look at alternative ways to debug my apps.
Luckily, it looks like there's quite a few options. I went with WiFi ADB by ttxapps as it looked well polished and allowed me to disable the screen timeout when debugging.
Worth a shot if you can't get ADB working or forgot your USB cable!