author contents window: wrong buttons

dear developers

(silva-1.5.8)

when working with author role i don't have the rights to close or  
publish a document. nonetheless the buttons "close" and "publish now"  
are shown in the contents tab window when working as author.

it would really be nice if those buttons could be replaced with  
"withdraw approval request" and "request approval" when working as  
author. this would streamline the workflow of authors considerably.  
what do you think? the buttons in the publish tab window are correct  
so this is probably only an oversight;-)

regards,
marc