Yep, totally agree. There are some issues open to create a hook_message_alter some of which seem to have some traction, but it will be D8 before this makes it in to core.
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Adam A. Gregory
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On Mon, Jan 25, 2010 at 3:10 PM, Michael Favia <michael.favia@gmail.com> wrote:
On Mon, Jan 25, 2010 at 2:07 PM, Adam Gregory <arcaneadam@gmail.com> wrote:
> template_preprocess_page and you can access and alter the message
> array/variable before it hits the theme.

Technically it has already hit the "theme" because you're editing the
preprocess function. But you are correct that hopefully this will work
for a single site implementation that needs this. However the need and
use for a hook at the module level is still apparent and valid. -mf