Use the search function and you will find that this topic has been discussed in some detail previously. People have strong opinions about "suicide" levers. I think the dangers are probably overstated but the benefits are negligible. A new set of brakes will provide better stopping power than the older models that came with panic levers. If you want to remove the extensions, you can probably do so without too much trouble. I did it to a bike years ago. As I recall, you will need to get a shorter bolt for the lever pivot.