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[007bond]

Unfortunately, there is no one big manual on everything you can do with UnleashX.  There are several tutorials floating around, however.
From what I remember of them, there is no way to do what you're asking.  The only way to do that would be to have an action run in place of the screensaver, but after the same time interval.
Find the requests list and put it on there, or message UnleashX