My car didn't even come with those screws in the front brakes. I never thought about it too much until i did the rear brakes and saw the screws. But i haven't had any problems with vibrations for three plus years of owning mine. Get rid of them and just do it.

"I bought new rotors for the car, once it needs service the car, along with pick-up, will be serviced at the brake shop, it's too inexpensive not to have them do it."

You must live in a cheap area if it is cheaper to have someone else do your brakes. The local brake shop wanted over 1k just to do one brake. I did everything, new front calipers, front and rear pads and rotars for around $1250. I never go to shops when fixing it yourself is cheaper.