This issue was originally posted months ago, but nothing has happened. My post was moved into a 5 year old issue and forgotten all about, so I'm gonna keep posting a new one every few weeks until it has been fixed.
CMD+V does not work in the naming input field in Save for Web / Save Optimized As dialogue box. In order to paste a name I now have to manually select the standard file name using the cursor, being careful not to select the file extension, right click and select Paste. Only then does it work. When you're resizing and saving hundreds of files this way it takes A LOT of extra time.