Am I correct in thinking that the right click menu for inventory items has gone? I found this really useful when transferring stuff from one character to another and avoiding "using" an item inadvertently when right clicking on it. Seems like a retrogade step to get rid of it.
You can set it to "none" (I have, and maybe you have), right click, shift+right click and some other I can't recall now. Check what it's set for you, and change it to right-click if that's the method you want .