Here is an feature that I would often like to have:
Move/Copy javadocs Up/Down
This is similar to the feature right now that copies javadocs to an new implementation when a method is being overridden/implementation.
What I would like to do is this: Copy to all implementations of a method the new javadoc I have just added to an interface. Obviously I would like to have the choice to over-write methods that already have a javadoc.
Optionally I would like to also be able to propagate a javadoc up the inheritance tree. Though this would not be as useful.