Not sure if easel uses the soft limits when jogging. However there have been times where I have wanted to cut the wasteboard.
This code should work. You could also add in a button press check so the user can bypass the check as well.
if (axis == "Z" && amount > 5){
var x=window.confirm("Are You Sure?")
if (x){
//Do It
}
}else{
// If X Or Y just do it or < 5
//Do It
}