use ssh access to run the command
lipc-set-prop com.lab126.powerd preventScreenSaver 1
try pressing the power.
Assuming you have now disabled the Screen Saver then you would use the opposite value to enable them again
lipc-set-prop com.lab126.powerd preventScreenSaver 0
I don't have a 4 so am unsure of the options for automating this.
Basically, whatever "launcher" you have, make it run those two commands (a script with an argument - OR - two scripts - OR whatever
So. 1) check it works 2) automate it.
HTH