Not so obvious feature already in the editor: If you hold down the shift button while clicking the keys in controller layer you can select multiple keys. Any actions made will apply to everything selected. A quicker way to select all keys could be nice though (Command+A or Ctrl+A) — I'll add that as a feature request.
Also, the Copy Controller Sensor function copies all of the Sensor Settings from the currently selected key (in Controller Layer) and Paste Controller Sensor will replace the selected key's settings with the copied version. You can only copy a single key (it won't actually copy if you have multiple keys selected), but you can paste to any number of selected keys.
2, 3, 5, 13, 89, 233, 1597, 28657, 514229, 433494437, 2971215073