[Feature request] SAFELY disconnect the controllers

[gingershaped]

I suggest that when holding a certain set of buttons for a while (say, SL and SR/R and ZR/ZL and ZR for 3 secs) it should open a dialog asking to disconnect, and if you answer yes it should SAFELY disconnect them. I'm always anxious I've disconnected them wrong and/or screwed something up, so this would be really helpful.