[JamesUS]

Actually this does require a code hack. You need to put this block of code:

PHP Code:

  $jointime = (time() - $userinfo[joindate]) / 86400; // Days Joined
  if ($jointime < 1) { // User has been a member for less than one day.
    $postsperday = "$userinfo[posts]";
  } else {
    $postsperday = sprintf("%.2f",($userinfo[posts] / $jointime));
  } 


directly under line 265 of admin/functions.php

Then into the postbit template, add $postsperday.

I haven't tested this at all but it should work.