Shouldn't diff mode have single key hotkeys in read only mode?

[JohnK <dernal@freemail.hu>]

I often use diff mode and since its buffers are read only by default,  it's strange it has no single key hotkeys like other read only modes do. (e.g. 'a' for diff-apply-hunk, etc.)

I know I can set these hotkeys myself, it just seems odd that there are no such keys by default when one uses the diff buffer in read only mode most of the time (e.g. by showing changes compared to the trunk), and editing diffs is more of an exception.

Shouldn't diff mode offer single key hotkeys too by default for efficient operation, and turn them off when the buffer is switched to writable (and then the current multikey hotkeys can be used)?