Site requests are the domain of Area51, where you can propose new subjects and organize a community around these.
There were some more law related site proposals made in the past (proposals no longer visible):
Law & Government -- For people who have questions regarding law, government, etc.
Rules and Laws for IT -- For bloggers, Internet users, software developers, social network users, and webmasters.
Legal Interpretations -- For this site is for Americans to ask questions pertaining to legal interpretations of domestic laws, and for European laymen to answer those questions.
All three failed to make it through the Area51 process though; Q&A about law is hard and fraught with legal pitfalls, and I can imagine that legal experts are cautious about participating in such a site.
In April 2014, yet another Law Q&A site has been proposed:
Proposed Q&A site for experts in the law, and those who want to find our more about specific local, national or international laws, or those who want to find out about concepts regarding laws in general. The site is not for specific legal advice.
which clearly tries to steer away from specific legal advice.