Well there a lot of different products available to you that we all use on this forum.
So I will recommend what I use.
To answer number two: I have heard that some dealers will use synthetic oil upon request otherwise others will insist on using their Kawasaki brand of oil. Amsoil/Mobil one and royal purple are the top three brands that I know of. When it comes to reducing engine heat onto your body there are a couple of things you can do. Yes changing the radiator fluid to a product called Engine Ice is the easiest compared to a antifreeze/water ratio with an additive that I use. The problem you will probably have is there a dealer won't do that because of warranty issues. The second thing you can do is to wrap your pipes with a role of 2 inch exhaust wrapping material. I now sometimes ride around with shorts with no issues of heat anymore.
To answer number three you will need the big three as we call it. This is not in any particular order but the three items are;(BAK) Big Air Kit / a Power Commander Five fuel processor and a good brand of exhaust slip ons, such as COBRA/Vance and Heinz or D & Ds.
For number four I would suggest taking out the speakers and the cone assembly behind them and checking for loose bolts. I'm sure that the speakers are good, there has been issues with loose parts under the fairing.
For number six, there was one member that had wiring from the ignition that was chafing on the gas tank. I believe that was an isolated case.
For number seven, there are several brands of cupholders. Mine is a Kruzzer Kaddie, which I purchased from a Harley-Davidson dealer. lol
here is a picture