Sorry for bothering you again with some forum feedback. 
Right now unstickying a thread marks the thread as unread or as if there is a new post inside. Is there a way you can disable this?
No sorry, admin functions (Close, Pin/Unpin, Move etc) all leave a message.
That’s a bit sad, I probably wouldn’t want a ‘mark as unread’-state for any of these. 
Oh well, it is what it is.