I don't see anything wrong with a ritual. I do not do them. The reason is because book doesn't ask me to do a ritual nor does it report that the coauthors did a ritual in the program portion of the book. If I decide to add something to the directions that isn't there, I should probably ask myself why it's necessary. To make it more meaningful? The action I take with the rest of the steps will give it meaning. To make it more effective? The book states that an honest and humble third step prayer will often produce a great effect. That effect will not be permanent unless I do the work.
I don't need to add anything, but have no issue with someone wanting to do so.