The nice thing about linux is you can do stupid, but useful stuff.

For example, I have a midi controller with faders that I use to control xorg (brightness, gamma, etc), so when I'm gaming I can turn off (brightness 0) monitors I'm not using with a slider.

I also recently added a second pointer device, so I could use a mouse to select and scroll windows while my keyboard remained in the editor for taking notes and pasting in what I copy with my mouse. I have a hotkey to switch between normal and split mode depending on need.