I created a custom made hr-Block (meaning: horizontal line, e.g. <hr>)
For that I had to add a dummy-field (I chose text) even though I don’t need it.
Please add support for Block-types that are always the same and cannot be specified by the user.
For the hr line you can use a line field https://getkirby.com/docs/reference/panel/fields/line and then create a block template with your hr.
Note that the edit button is still there and useless so I created this suggestion https://kirby.nolt.io/223
As I understood it, he rather means that even if you add a block that has no options, the drawer will still open.
Related, you can set wysiwyg: true in your custom block blueprint which will prevent the drawer from automatically opening.