[haiku] Building/installing only specific components

Hi there,
at BeGeistert I learned how to use UserBuildConfigs for building/installing from Linux and that e.g. 

"jam -q @disk update-all"

would build/install Haiku using my disk-profile without wiping my home folder.
Axel (or Ingo? Can't remember...) mentioned that

"jam -q @disk kernel"

would likewise only update the kernel of my installation.
Now I'm wondering what other components can I update/install without touching the rest of the system. I've been looking through some files in /haiku/build/jam/ for a definition of possible terms, but haven't found it. 
Can anyone give some directions?
Thanks!

Regards,
Humdinger

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