INDIEKIDUK Its more efficient to use hot corners for things you do frequently, e.g. dashboard, all windows, app windows show desktop. Since you have only four corners it wouldn't be sensible to give up one of them for sleep display which most people will only do maybe 1-2 times a day.
With SleepDisplay in application form you can hook it up to anything you like, e.g. quick silver, launch buddy, remote buddy...whatever you like.
(Version 1.0)