Wow, tons of topics here. Let's see if I can remember all the ones I wanted to reply to....
Announcing to LEO that you are carrying: Not required in NV. The NV. statue only reads that you are required to ANSWER the cop if he asks and if you do not answer then it is a $25 fine. That's it. In Michigan (years ago) it was absolutely required to inform the cop upon first contact that you are a CCW holder and are (or are not) carrying. Each state is different.
Complying with cops in NV: I carry a little card I printed up that reads something along the lines that "I DO NOT consent to any searches and by law (NRS being quoted) cannot legally be detained unless suspected of a crime and am invoking my right to remain silent". If you are stopped while driving you are required to present license, registration and proof of insurance. Not driving, you are required to present NOTHING. And only required to state your name if the cop gives pc you have something to do with a crime or a potential crime. Best bet, say NOTHING ever. But, this is all theoretical for me for I have yet to be stopped while armed.
What to do with the gun if stopped by LEO and asked to disarm: I would put my hands on my head and tell him, "I'll walk YOU thru it, but I'm not touching it".
What rounds to carry to help you in court: It used to be said that you should have the first shot be a ball round so you could claim in court that you wish to not kill anyone and hope that the first shot would scare them away. It's also been said that you should carry EXACTLY the same rounds the cops do so that you can claim that, like the cops, you merely wish to DEFEND and not MURDER. Of course Metro has a reputation of murdering so doubtful that will work here. And it's ALL conjecture. I say, carry the rounds your research shows will best stop the bad guy, for if you don't survive the attack there will be no day in court. And personally for me, I carry Federal Hydra-shoks JHP 147 grain in my nines and in my 380s either the same in 90 grain or PMC Starfire HP 95 grain. But that's just me. Tons of research out there that will allow you to form your own opinion on what you'll like. Oh and don't forget to make sure your gun will eat 'em okay.
Kids touching my holstered gun: Never happened to me. Actually, kids seem to be afraid of it when they see it.
The way you dress / look affects how EVERYONE treats you. Been that way since we got eyes. Some judge more than others. I actually count on it. I learned growing up in Detroit to look like a mean SOB. It didn't make me any meaner, but it fooled the bad guys. Look like a victim, be a victim. Look like a thug, get treated like a thug. Just the way it is...even if some like to think it isn't. As for race, that one is not as bad as it used to be, but I'd try to be white if I were you. Just kidding. We are what we are and unlike dress / looks, you can't change it or how others may stereotype your race.
How many rounds to carry: As many as you care to. There have been studies done that show accuracy in a panic situation is terrible. And I have preached for years, fight that tunnel vision we all get in a panic situation because you will surely miss seeing the bad guy's partner(s). Point being, NEVER assume you need just enough bullets for ONE bad guy. They almost always have partner(s) / lookout(s). On that note, it's also why I encourage point and shoot over aim and shoot. Looking down the sights is great for accuracy, but it makes you focus down the barrel when it may be advisable to keep your peripheral. That's just me....but realizing that is also what made me change my opinion on CrimsonTrace Grip Lasers. You get the best of both worlds - point & shoot with accuracy. Also, as Mac said, in a defensive situation you may not have the use of both hands. Another argument for Lasers. YMMV.