when I hit the printscreen button on my keyboard, I want to take a screenshot (using scrot)
when I hit alt+printscreen, I want to take a screenshot of the active windows
when I hit ctrl+printscreen, I want to take a screenshot with a delay of 5 seconds (scrot -dc 5?)
I mapped the printscreen key to a simple scrot command and alt+printscreen to the above command, and ctrl+printscreen to a scrot -d 5 screenshot.png to make a 5 seconds delayed screenshot.
Works great.