short code for more than one authors but not all

hi,I have just tried [starbox] or [starbox id=USER_ID],and [starbox id=all],and they all work.But some articles are composed by two or three members,how can I display a certain members on a specific post?
I thought I can add thses IDs togther,like [starbox id=quintus][starbox id=lucy][starbox id=ken],and they will work,but the answer is no ):

http://wordpress.org/plugins/starbox/