Its a bad idea, you have to think that if everyone is signed up, they will all dump, and crash it more. You may want to look into insider trading to make sure its not connected.
Im not so sure if this really leads to more drastic crashes (lower minimal values). It will just reach the minimum faster and the market price will thus reflect the "true" price sooner than without such a service (where i have to way until i have time to check google news). Fundamental indicators are used by fiat-world-traders all the time and thats not bad. In the end liquidity and fast trades establishing market prices quickly are good things that could still be enhanced in the bitcoin world.