Oh wait, I can't even say that because it would be a compliment this basically non-existent documentation does not deserve.
I just spent over 4 hours on trying to find out what the thing I want to add is even called and how to implement it.
I did not have any meaningful modicum of success.
First I looked around for an overview that would give me the general gist of the module and its terminology.
There isn't any. At least not 'easily findable' in any definition of the term.
The README-file is totally useless for this purpose as well. The 'documentation' told me to use the advanced help and just click on shiny question mark buttons. I did that, and since then am about 30% sure that what I want to add is called an 'area'.
So if I really need an area I have to define an area-handler class. I think…?
But nowhere does it tell me how to register an area handler or how to implement one.
So then I watched a talk or screencast or whatever you call those damned things. (Whoever came up with the notion that a "video tutorial" is better than a readable, searchable documentation was clearly retarded, so I decided not to demand painful correctional treatment, but went for quiet loathing instead).
After about an hour of listening to some guy with bad pronounciation go "uuh, uuuh, uhhh" in real shitty audio and even shittier video, I was none the wiser.
I also asked, considerably nicer than this, in #drupal-views and #drupal if anyone could tell me even what the thing I want to add is called. Predictable, I got exactly 0 responses.
So dear Views developers,
please, please, PLEASE, for everything that keeps a developer sane - DOCUMENT YOUR SHIT!