Here's an interesting thought -
I was looking through the Petzl website and I noticed the via ferrata lanyards. These are designed to reduce the impact force on the climber because it is possible to have a fall that is greater than factor 2 while climbing via ferrata routes due to the steel cables used in securing the routes. Couldn't these lanyards be used in place of screamers while climbing? Wouldn't it be possible to tie into a via ferrata lanyard and then into the rope to reduce impact loads on the pro? Hell, couldn't you just put a screamer between you and the rope?
-discuss-