Em i don't think so- at least not directly. It can however be used to reinforce good behaviours and prevent bad behaviours.
For instance, on this forum there was a thread about preventing/ teach dogs not to chase cars. What I adviced in the situation was as the owner saw an approaching car, to tell the dog to "leave" the car and then click the dog just as the car past at the split second before he/she started to chase. I would then treat and praise the dog. Repetition of this proccess would teach the dog to leave and not chase cars on command and eventually all together.
Clicker training is more of a technique that uses positive reinforcement, i.e. rather than focusing in on the bad behaviours and punishing, focusing in on the good behaviours just before the dog would perform a bad behaviour. Does that make any sense. I'm not sure if I explained it well- i think I made it sound a bit over complicated there.
As Sunny can be a bit nervous, positive reinforcement techniques are definately techniques that I would advise you try with him rather than using techniques which put emphasis on the bad behaviours.
I hope this helps.
Here is a link to a site that has some info. on clicker training which might be a better definition that what I just wrote:
Clicker Training - An introduction to clicker training

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