Hey all! BPUP is a new free Blender add-on that allows you to pause and unpause Blender at ANY time, Including during a render. When you pause Blender, a icon in the taskbar will appear. To resume the Blender application, simply left-click on the in and hit 'Resume'. BPUP can even hold a pause when your computer is asleep!! This add-on is currently for Windows only. It can be downloaded free from Gumroad.