Stash should provide a way to log all actions made by users. I'm talking about actions not in the terms of GET/PUT/POST, but rather something similar to "Activities" in Gitorious or "News feed" in Github.
In my opinion it's a must-have feature for both administrators and project managers. In each company people have to know who, when and to what gain access and such actions have to be logged somewhere.
The best would be if I could see them somewhere in Project/Repository view.