hi mate and welcome,
first mine does click but it is low in volume i dont think they should be loud it bugs me more than anything
second it beeps in reverse because the reverse gear is next to 1st and its very easy to put the car into either gear when at a stand still so it just lets you know what gear ur in as not to reverse into the car sat behind you at a set of traffic lights.
i had a celica gen 7 which did the same