Drupal 6 skip form validation on Delete
This module allows you based on your choice of node types skip the form validation on Delete. This can be done in two ways either by the Delete button or by an extra tab link beside View and Edit. The confirm dialogue will still remain.
When Drupal 6 submits its forms it always gets validated, even on Delete action, and in many cases it can feel ridicules validating an object when you are deleting it. However there can be modules that might need correct information in some fields on the node to be able to clean up etc. but I have not seen that so far, but you should be aware of that.
Install as usual. It will add some menu hooks and permissions and a administration page. To activate it you have to select node types and what kind of delete feature you want, button and/or tab. The tab will only show up on Edit view.