I'm aware that a lot of commands aren't documented on the website. Didn't find the motivation to add them yet. Most of the missing commands are simple settings which are either set via more or less self-explanatory UI elements or the "more"-menus which already come with short descriptions. Therefore it's not super important to have extra documentation.
May add them eventually. Won't promise anything though.
@ StirlizZ-Fapicon: I didn't implement the physics system (same for the lighting system btw) which makes it especially difficult for me to document it.
Therefore it's unlikely that it will be documented unless SQ wants to provide a detailed documentation I can put online.