I unplug man when I am done using it. I am still very careful not to damage the cables, but I don't like leaving it out or running hot at all. The idea to use extensions is pretty smart, they can take the wear and tear of plugging in and out each day.
Have a couple of batch files that run: net start ovrservice and net stop ovrservice
Respectively to turn Rift on and off when I want to use it. They are setup as desktop icons with keyboard shortcuts assigned to make it really easy to start and stop whenever I want to use it.
The nice thing is stopping service closes everything Rift related in one action including Oculus home. With ovrservice shut down there is no discernible heating so I keep it plugged in all the time. This also prevents unnecessary background resource consumption constantly trying in vain to connect to facebook systems.
You can leave it plugged in without problem. It may be slightly warm to the touch in standby, but it should be fine. I've never had an issue and mine's been plugged in for months.
