Many suggestions of improvement

[Lipomo]

Why? For what encoder? By what rules?
(no clue, why one would change the min key-int value)
Also note that changing the max gop size, has impact on other settings. (lookahead, level&profile compatibility,...)

Cu Selur

- Higher keyint would be slightly better compression for videos above 25fps, and lower keyint would be better for seeking for videos below 25fps. Also the max lenght of GOP would be the same (~10 seconds) 
- For x264 (and x265?)
- The FPS * 10 formula that is generally recommended and used
(for min keyint I don't know, in t he recommended formula it's FPS * 1)