I am using t3h's last build (version 0.3) and it seems that the keyboardtype parameter (as well as others) is not recognized -- in fact when started from xterm it outputs:

~ $ BasiliskII
Basilisk II V0.9 by Christian Bauer et al.
WARNING: Unknown preferences keyword 'udptunnel'
WARNING: Unknown preferences keyword 'udpport'
WARNING: Unknown preferences keyword 'keyboardtype'
WARNING: Unknown preferences keyword 'dsp'
WARNING: Unknown preferences keyword 'mixer'
Reading ROM file...
WARNING: Cannot open /dev/fd0H1440 (No such file or directory)
WARNING: Cannot open /dev/fd1H1440 (No such file or directory)
Using ESD audio output
gdk_window_foreign_new
WARNING: Unknown VideoDriverStatus(18)
WARNING: Unknown VideoDriverStatus(18)
WARNING: Unknown VideoDriverStatus(18)

Also doing BasiliskII --help, you don't get any reference to these parameters.