Vanilla in Cherokee (plus jsconnect)

All hints mentioned in an old related discussion to getting clean URLs working did work for me too. But URLs with parameters (?something=value) don't seem to work. I'm having problem particularly getting jsconnect to work. URLs like http://forums.whomustnotbenamed.com/settings/jsconnect/addedit?client_id=youknowwho redirect to http://forums.whomustnotbenamed.com/settings/jsconnect/, and not to the actual edit form that should appear.
Also, while logging into the forum through WordPress, the thing is redirected to http://whomustnotbenamed.com/?VFRequest=connect?client_id=youknowwho&timestamp=1364525422&signature=ba6668da5640afc45f7c4aeaf2064c35&Target=/dashboard/settings/jsconnect. Now that URL doesn't work, of course, due to the 2 question marks in it. The correct URL should be http://whomustnotbenamed.com/?VFRequest=connect&client_id=youknowwho&timestamp=1364525422&signature=ba6668da5640afc45f7c4aeaf2064c35&Target=/dashboard/settings/jsconnect&callback=test
Any ideas?