One of the reason I switched to opera was because of the workspace. I can easily assign my study related tabs and entertainment tabs to designated workspace. I feature I really wish opera had was the ability to assign specific speed dials. For example, If I am using my study workspace and I created bunch of speed dials related to my study content and whenever I open a new tab I can only see those study related speed dials. That would immensely help my workflow and also I will be able to study without any distraction. Same goes for other workspace as well. Having specific user configurable speed dials for each workspace would be a terrific feature. Of course this is optional to the user and they can choose enable it or not.