Session Expiration warning is worded a bit strongly... :)

The warning in shib_auth_init which displays after destroying the Drupal session when the SSO session expires:

drupal_set_message(t('Your Drupal session has been destroyed because your SSO session is lost or expired.'), "error");

...is worded a bit harshly and the error is a bit scary to my users.

I've personally toned it down to a warning:

 drupal_set_message(t('Your session has timed-out. Please log in again.'), "warning");

I've hard-coded the change, but would it be possible to allow for a small section in the UI to set a custom warning or error when the session expires?