What Is the Difference Between a 3300KV Brushless Motor and a 3932KV Brushless Motor?

That is pretty much it... The 3932 KV brushless motor gives you more power, and it is more electricity efficient. (if you do not top out the max speed) It all depends on what you want. I switched to the brushless motors only to save me some electricity and get me out of trouble in case of anything... like someone trying to lift and steal my car or someone trying to run it over. I topped out my brushless motor once just to see how fast it goes and thats about it.

1. 2 stick controls for a Traxxas rustler, going brushless motor?

When I first started in r/c there was no such thing as "RTR Ready To Run", I had to build it from a box of parts. I still love building from a box of parts. If I ever buy an r/c that is pre-built, I tear it down and rebuild it my way. The first control I've ever had was the 2 stick and everybody had a pistol grip type which I wanted. Most company's build the cars for you and include the pistol grip style controller because that is the most popular. If you want to change from pistol to stick, it's very simple. Go to your local hobby shop and ask them for a basic 2 stick, 2 or 3 channel 75mhz FM transmitter without the servos. They will probably suggest a Futaba or a Hitec. Both are great and will work great with your exitsisting Traxxas servos. You want FM because because of a longer range and a cleaner signal for use with a brushless motor. Unplug the servos from the Traxxas receiver and pull the receiver out of your car. Set the radio and receiver aside somewhere. Now install the new receiver and plug in the servos. Steering is on channel 1 and throttle is on channel 2. If for example the steering does not work, unplug the servo from channel 1 turn it around. The black wire on the servo should always be away from the receiver. You being a beginner I would not recommend a brushless system. Mainly because of the cost involved. A brushless system is not as forgiving as a brushed system. Remember in brushless the electronic is converting DC power into AC power. If you short anything out there is no reset button espically if get anything wet. I hope this helps. Good Luck. Sorry I made this so long.

2. Varying Speed of Brushless Motor Within The Same Cycle

You might be able to control the motor in the way described, but that will not be equivalent to the mechanical system described. The mechanical system appears to alter the pitch of just one of the two blades of the propellor for part of a blade revolution. Altering the speed of the propellor would alter the speed and thrust of both blades equally.

3. what is the advantage between an inrunner and outrunner brushless motor in a model aircraft?

Outrunner Vs Inrunner

4. Can a motor say a brushless motor, run a bigger alternator with some configuration like gearing ratios, so that the alternator will produce more power needed to run the motor?

No, this question seems to be asked about twice a week in one form or another. There is no way to convert energy back and forth in such a way that you get more out than you put in. Please look at prior answers or try to remember some basic science.

5. In RCs toys what are the advantages of having a brushless motor vs a brushed motor besides increased speed?

Brushed motors have moving parts (magnets) that wear out over time, they also use a different power source. Brushless motors are pretty much maintenance free and are used with lithium powered systems. Lithium is the best battery power source available today. Lithium batteries do have their setbacks. Charging them too long can result in fire and if you run them down too far before charging they will ruin. As long as the person you are buying this for is going to pay attention to this it's okay. If this is a Kid you might want to stick with brushes and Ni-con Batteries. If it's a plane i suggest gas powered and make sure you choose a beginner plane...IE BOX FLY 40. on Cars the gas powered ones are very cool as well, just make sure whoever your getting this for is responsible and has some knowledge of mechanics. Sorry I will answer your question now Brushed motors are a bit more to deal with but nothing like the unreliability of the lithium batteries. The lithium batteries will produce more power for longer with a shorter charge time and they do not slow down at the end of a charge. they run 100% then they stop. Again the lithium batteries are a pain to care for and if you make a mistake, it will cost you money and possibly pain.