That's an interesting question as you pretty much covered all the basic funtions in the P&S.
First thing to do is to download the PDF manual of your desired DSLR from the official website and read it thoroughly. As you are familiar with all the basic funtions, you will notice anything of interest.
Other then that, i don't see it the way you do. It's not wise to compaere the DSLR with P&S on the basis of similar functions. There are some P&S which have more functions then an entry level DSLR and probably you can count some mid range DSLR's too. but that doesn't make the P&S better....Well, among many other things the most common differentiating factors are the quality of the features like better ISO performance (Less noise), and the choices of huge variety of lenses according to your style of shooting, more dedicated buttons to perform quick actions, better viewfinder etc etc. At some point, if you keep on growing with photography, you'll be stuck with the P&S, no matter how good it is. In the price range of some good quality P&S, you can easily get an entry level DSLR which will most probably out performs that expensive P&S. You'll always have the option to buy lenses according to your style of shooting. And this something which you should not take for granted. The most basic of style is the Shallow depth of field effect. It hard to achieve by a P&S, but not a problem if you have the DSLR and the right lens. I can share a lot of other factors with you. Just buzz me if you need me to. In the mean time, download the PDF, probably A-500's, if that's what you are interested in, and then tell me what do you think about it or any othe DSLR model.
Have a nice day
If you keep on shooting with the P&S for two years, there will be no need for you to ask the questions you inquired about in your post. You'll definitely get the whole idea
I have also got a question for you. You are 15yrs old, as you mentioned yourself. And in your signature, you are mentioning "Pupil of 3rd class". Why? Did you started late or .......????