The reference manual ConTeXt commands gives all supported options by command. Unfortunately, there is no description about the conventions used.
¹ ² \setuphead [...,...] [..,..=..,..] ¹ SECTION OPT ² frontpartlabel = name ... expansion = yes NO xml ... sectionstarter = COMMAND PROCESSOR->COMMAND ... sectionsegments = NUMBER NUMBER:NUMBER NUMBER:* NUMBER:all SECTION SECTION:SECTION SECTION:* SECTION:all ... referenceprefix = + - TEXT ... incrementnumber = YES no list empty ... page = inherits \page ... hang = line broad fit NONE NUMBER ... command = \...##1##2 ...
Furthermore, we don't know anything about the options. What are these options for? How to use these options?
The notation is partially presented in ConTeXt MarkIV an excursion (c.f. page 10, page 117) but the complexity of the notation (often unknown) makes the exploitation very hard.
How to understand (know) ConTeXt commands?