Recently I was replacing WinAVR in the ide and I had to modify a lot of files from the ide because the new avr-g++ didn't worked (new one required working directory set on the process creation). I am not sure if I did all the things from that doc but magically the same sketches from original 1.0.1 turned out smaller in my modded 1.0.1.
Also I found something very nice to add: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1224729260/all to enhance all the experience of having an updated winavr-avrdude
And noticed again, how efficient is the new compilator. Trying to match similar text to avoid wasting ram 
I will keep making tests and eventually release a fully tested 1.0.1 with the new winavr 
but anyway it will be nice to see that in the official version one day.