Think of improving your chances through a focus on non-academic factors in terms of decreasing marginal utlity. Law schools principally care about 3 things: LSAT, GPA, and whether you are black or hispanic. Putting in hours at "Lawyers for Retarded Midgets" is not likely to play a huge role - uness you are applying to a school with a particular focus, like St. Johns (PI), or VT Law, (Environmental). If there was something you could do beyond LSAT/GPA/Race to seriously affect your chances, odds are you already did it, and not because of the admissions process, e.g., fighting in the Iraq War, or something else equally rare for an applicant.
Also, did you really need 25 posts to say all that?