hide format tips in signature field

Same here. I've looked at some of these solutions http://drupal.org/node/35122#comment-746238 but it makes sense for Better Formats to handle all cases - signature included.

Same here, I thought the module is not working, as it was my main reason for installing it. Subscribing.

Other modules will be able to take advantage of BF in 3.x.

See also #366015: Add module to fix missing input formats in Drupal core.

Whilst we wait for BF to be expanded, try this in your custom module.

function MYMODULE_form_alter()
{
  switch ($form_id) {
  case 'user_profile_form':
    $form['signature_settings']['signature_format']['#type']='hidden';
    break;
  }
}

This hides the form, but leaves the values. It does hide the BF "tips" so you could re-add these by also modifying the $form['signature_settings']['signature']['#description'] value.

6.x is now unsupported.