Custom scenario scene background image in RiSE

Cool tip Simon. Nevertheless i prefer it being in Rise somewhere... blur background checkbox.
As i can get it done by CSS, but most of the editors that will create the courses/scenarios donot know how to get that done. Further more as Brian asked for too, i do prefer having the option to hide, disable or make a character transparant, because i do want to use custom backgrounds without an character in front. Would be even better if we could use custom .png's in front...