>Edit file names;

This was done purposely. Too many people were accidentally changing the names of files/folders. It will be re-added if we can make the editor act in an expected manner, rather than going into editing mode at strange and confusing times.

>Drag files into sub-folders.

This was also removed purposely, as the entire Drag & Drop system is being redesigned to use Java's built-in system instead of our hand-crafted one. Dropping will (hopefully) be re-added before 4.2 is released.