"Bomb" or other: only below active selection?

[LetsSee]

Hi all,

while I use shortcut to explode a selection, since you have to reselect within/below again and again, Smustard's "bomb" script is of great help of course.

But in the docu I cannot find how to limit "bomb" to the current selection and only "bomb" BELOW that. Anyone knows how to do this?