2) could such feature be implemented in SMW core, that is: for all
result formats? Or must we add these parameters to every result format

I'll answer this question from the technical side. Not every format supports this functionality and this is also not going to happen. (Forcing them to do is makes little sense.) Thus having a global parameter that "does not work" for a lot of the result formats is rather awkward.


Jeroen De Dauw
Don't panic. Don't be evil. ~=[,,_,,]:3