>> The reason why I'm asking this is to know how the corresponding
>> function/macro for repeat-mode should be named in master.
>> And it seems `define-repeat-map' would be the right name.
>
> Are you sure you need a `define-repeat-map'? Just adding a :repeat
> keyword to `defvar-keymap' would be enough.

Thanks for the patch.  It would be nice to add also
:repeat-enter and :repeat-exit.  For example:

  :repeat-map t
  :repeat-enter '(enter-command ...)
  :repeat-exit '(exit-command ...)

Or maybe a shorter variant would be preferable?

  :repeat '(:enter '(enter-command ...) :exit '(exit-command ...))

Anyway this supports the first variant: