6
Just in case anyone is as colour blind (not really) as I am, there are 4 changes to be made in system_blocks.php, and 3 changes to the template file (one can easily, as I have done, oversee to change the colspan in the th-tag of the table displaying the info).
Also, if you don't see the changes, change your theme, as this will update your actuall DB file, stored under templates_c (which you need to have deleted previously, as it will only update, if a theme file is actually changed).
Thanks again smdcom.