At /admin/settings/signit/addconfig I get:

warning: Missing argument 1 for signit_create_form(), called in /home/ianrd/public_html/drupal/modules/signit/signit.module on line 1179 and defined in /home/ianrd/public_html/drupal/modules/signit/signit.module on line 282.

Your tool looks absolutely wonderful and I can't wait to use it. I like what you've done so far and I know many people are thrilled by what they've seen.