There are 10 possible "buttons" that the stalk can generate, using the physical buttons in combination with various "twists" and whatnot. Hijack uses these names for those 10 "buttons":

KOff KSource KAtt KFront KNext KPrev KVolUp KVolDown KRear KBottom

By default, they should "just work".

But if you want to change what they do, then they can be remapped. For example:

[ir_translate]
;; Use the stalk "Off" button as an empeg "Info" button instead:
KOff=Info