docs: Provide full list of options

[mdvorak]

I had to go thru all of source codes to discover, what functionality is enabled by default, how to disable things I don't want, and under which keys configure the rest. I would welcome (and any other newcomer), you would kindly:

• provide info for each used library, whether it is enabled by default, which key disables/enables the feature, and under which key are the options, if any. Its not everywhere.
• add to home page example all option keys for each library (not all its options, but to have quick view of what is where, plus possibly defaults).

Cheers