better messaging w/ mod_dontdothat?

I've recently been tasked to implement mod_dontdothat, and the
implementation is in jeopardy of being cancelled due to the apparent
lack of ability to customize the error messaging returned to the user
when mod_dontdothat disallows an action. Is there some means I'm
missing of configuring this?

As I understand it, when an action is disallowed, mod_dontdothat
basically returns 'nope' which Apache then translated into a 403 which
is returned to the user. The (uneducated) user gets a pop-up from
Tortoise/Cornerstone and basically doesn't know why they're denied. In
fact, if they pay any attention at all, they 'recognize' the pop-up
and think their password is wrong. :(

Is there some means to actually tell the user they authenticated
successfully, but they tried an action that we're disallowing? Ideally
we'd point them to a wiki showing what is/isn't allowed.

-- 
Douglas J Hunley (doug.hunley_at_gmail.com)
Twitter: @hunleyd                                               Web:
douglasjhunley.com
G+: http://goo.gl/sajR3