[rsbac] How does the faked root work?

[Praise]

I am using a 2.6.11 kernel with rsbac 1.2.4 on a gentoo system. My target is 
to make the root user act as a normal user, and I have moved all his CAP 
rights to another user.
However some programs have the dumb "uid 0" check in their code.
One is the script which start services. Another one is portage. Another one is 
iptraf.

I have this option set up:
zgrep FAKE /proc/config.gz
CONFIG_RSBAC_FAKE_ROOT_UID=y

Stracing iptraf, I can see this line:
getuid32()                              = 402

Am I misunderstanding how that option work?

Praise