While I like Compiz sometimes, I find that enabling it by default is a bit extra. May be it's better to make it as a boot option, similar to Adriane?

If you used UNetbootin to create a bootable USB you can edit syslinux.cfg in the USB root to permanently disable Compiz:

default menu.c32
prompt 0
menu title UNetbootin
timeout 100

label unetbootindefault
menu label Default
kernel /ubnkern
append initrd=/ubninit ramdisk_size=100000 lang=en vt.default_utf8=0 apm=power-off nomce libata.force=noncq hpsa.hpsa_allow_any=1 loglevel=1 tz=localtime no3d