Comment 6 for bug 38910

Related: I'd like to be able to lock my workstation when the workrave screen is up. I suggest adding a tab in the preferences with a table to fill in, with some good defaults:

| Name | Command |
------------------------------------------------
| Lock | gnome-screensaver-command --lock |
| Mute | amixer sset Master toggle |
| Suspend | echo -n mem > /sys/power/state |
| Pause | audacious --pause |

And then we'd get those buttons on the take-a-break dialog. That's probably a lot easier than trying to filter keystrokes.