I have object styles within my families (mainly Furniture/Fittings), that are used as insertion helpers, that I don't want to print. At the moment I switch them off and on in the Model categories using a View Template. Having an Object Style that was is a non printing element, like a non printable layer in AutoCAD would be a huge benefit.
I Know there is the invisible Line, but you have to select the item before you see these lines.