The wiki is not a complete user guide. For example, under Television, there is no entry about how to set up for recording a program.
There is a whole board dedicated to TV. The sticky posts there might help get you started. This one, for example, thanks to astromo:
http://yabb.jriver.com/interact/index.php?topic=90998.0We switched from using a formal manual to a search/wiki/forum model about ten years ago.
To take your example of TV, just documenting that would be an enormous job and one we couldn't do alone. There are so many devices, protocols, EPG's, countries, use-cases, etc, that it's just not economically feasible. And even if we did it, the world would have moved on by the time we finished. The EPG situation is changing very quickly now because of changes Microsoft made for Windows 10.
If the external conditions remained stable (OS, devices, protocols, use cases ...) it might be possible, but in the end I don't think it would be better. Many of the most useful and interesting posts come from a wide array of end users who are keenly interested in a particular corner of our universe. They are among the most knowledgeable people on the planet in their field of expertise. Collectively, they are far better qualified to write on these subjects, and because of the forum and the wiki, you have the benefit of everything they've written.
For the sake of clarity, I'm speaking on behalf of JRiver.