Please allow copying, deleting, etc., automation items across tracks using keyboard commands (Ctrl+C, Delete, etc).
For now, REAPER only edits the last selected automation item...
In the GIF above I selected all automation items (different tracks), hit Ctrl+C, placed my edit cursor and then hit Ctrl+V. REAPER only copied the last selected automation item.
Same with delete.
We can select all automation items and trim edges, move them together, etc., but we can't delete or copying them all at once using keyboard commands.