Out of curiosity, would it be a good idea to add an option to enable/disable the position jitter for characters within their cages? I'm working with a custom font that displays best when its unwarped and on a uniform level, so I'm not really looking to prevent bot submissions by skewing text.
This was pretty easy to take care of in captcha/image_captcha/image_captcha.user.inc on line 308:
// add jitter to position
$pos_x = $pos_x; // + mt_rand(-$dev_x, $dev_x);
$pos_y = $pos_y; // + mt_rand(-$dev_y, $dev_y);
But now I have to disable module updates :(. I would totally write a patch to accommodate this update if I knew how! Adding a checkbox on the admin page is pretty minimal. Is this worth spending time on?