The member chooser which is used in the "Override Methods...", "Implement Methods..." and many other actions could be more keyboard friendly. Currently, it is not possible to make a discontinuous selection or select members in a specific order using only the keyboard, while those things can be done with the mouse.
Other issues:
When more than 1 member is selected pressing the Down key on my keyboard does nothing. I expected it to remove the selection and select the item below it. Workaround: use the Insert key for this
It would be nice if the members behaved more like checkboxes. I would like to be able to navigate through them using the cursor keys (like now) and then select or deselect them for the action (e.g. Override) using the Space key.