Support of !important in background-image attribute

I have a lot of background-image definitions which have the !important keyword added in the end like this:

background-image: url(../js/grid/page-first.gif) !important;

But currently it's not possible to annotate this with SmartSprite like this:

background-image: url(../js/grid/page-first.gif) !important; /** sprite-ref: hsprite; */

I think this is a vital point - unless there's a workaround for this case.