I noted it is possible set a number of hotkeys in Linux Mint 17.1 using the keyboard application, but there's not possibility to set the hotkey "Show All Windows"; you can only set a button using Preferences -> Hot Corners.
You can set customize hotkey too, but I'm not able to do that. Browsing on the internet, I did not find anything as tutorial, wiki,... to do that.
Can someone suggest what I have to do setting that?