Ihor Radchenko <yantar92@gmail.com> writes:

> Instead of advice, you can also provide a simple patch implementing the
> described functionality in org-agenda-bulk-action. I do support adding
> this functionality to org.

I took a look this morning and came up with the attached patch.
Essentially if the custom function is a list then the first element is
the bulk function and the second is the argument function.

If that looks reasonable I can add some documentation and submit a
proper patch.

Kevin Foley