1. Yes, there is a place. Mespotine has made a nice summary of all commands and functions.
https://forum.cockos.com/showthread.php?t=217794
2. If you want to participate in the video processor coding process your are very welcome. Here you find a nearly complete list of all user made presets:
https://forum.cockos.com/showthread.php?t=213832
Greetings
Eli