Not sure if I undrestood you correctly, but you can still enlarge the windows by double clicking on the title bar.
Thats still 100% more clicks, if it actually worked like the current green button.
The setting for double clicking the title bar only works like the yellow key, minimizing.
What a lame move.. I use the expand button all the time.. why not just add a 4th blue button
Because apple sees it as a traffic light A blue button would be perfect seeing as how apple is adding so much contrast and colour to everything.