Ok, thanks, Hardy Ferentschik! Personally I'm also not convinced of adding this, I cannot see a good use case really (same goes for Guillaume Smet AFAIK).

Marko Bekhta, do you have any specific use case in mind where one would be using this? If not I'm inclined to close this one as "Won't fix". Sorry for bringing it up only now, I wasn't quick enough to keep up with your speed of changes. That said it's always a good idea to quickly sync before hacking away so we are all on the same page.