Using %% in confirmation alerts in admin generator

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The docs say:

In the string values of `generator.yml`, the value of a field can be accessed via the name of the field surrounded by `%%`.

This works great in titles but doesn't seem to work much of anywhere else. For example, I'd like my delete confirmation alerts to say "Are you sure you want to delete joeuser@domain.com?" instead of just "Are you sure?" My config includes this:

object_actions:
  delete:
    name: Delete User %%email%%
    action: delete
    icon: /images/icons/delete.png
    params: confirm=Are you sure you want to delete user %%email%%?

However, it renders both the button help text and the alert box text as the literal string "%%email%%" instead of the user's actual email address. Is this an oversight? Did I misunderstand what "string values" means, or am I out of luck?

Using %% in confirmation alerts in admin generator

> have you tried %%=email%% ?

No difference, still shows the literal string '%%=email%%'

documented on: 02 August 2007, Yoglets