Thanks for the replies.
I have a very similar situation as Ernest mentions in his previous post. I am trying to run a process from a BO's edit form.
I know I can add a custom button to my form to make this happen, or even just some html, but that would definitely not be as neat as a Form Operation button. I accept support's position on this too and appreciate the philosophy behind it - I just wish it were different 🙂
My solution will be to allow the user to invoke my process from a Top Bar menu item. On reflection, my process (which is to view the change history for instances of a particular BO) will most likely not be a frequently used feature, but an important one just the same. So the process's demotion to a menu item will be more aesthetically sensible too.
Thanks again for the posts.