I'm Not That Big on National Mandates, But...
...requiring dash cameras in every police vehicle would be a great idea. Via Radley Balko, of course, video in his post here.
I do think Ms. Harmon has her lawsuit a bit misdirected. I don't think Tasers per se are the problem. If this guy didn't have a Taser, it would just be a nightstick or physical force. The issue is that many police act as if they are dictators of the local area within their line of sight.