Impossible to use lightbox config options with superfish menu item.

When I tried to alter menu item with $link_options['attributes']['rel'] = 'lightmodal[|width:432px;height:300px;]'; I`ve got cutted rel attribute rel="300px;]" and as result page opens as a normal node instead of lightbox. It happens because of using filter_xss function (line 1007). Probably it is good idea to replace this function usage with a custom alternative analog that allows usage a bit more extra symbols.