Actually my friend....it is very very easy ;) . You can actually disable the VDIM, TCS, and VSC. Not sure about the EBD. But you will definitely still have ABS.
http://www.realtechnews.com/posts/2176
Check out this link. I've tried it on my 2007 IS 300 (UAE spec). It has a 3.0 litre engine (3GR-FE).
It took me a couple of tries but it definitely works. Have fun.