Thanks for trying to help me start over, Connie.
I wanted advice, but confused the issue by going off on too many tangents with too many irrelevant questions and comments. I thought it was really interesting, myself, and I'm still thinking about "fear" as a reflex (see snake, jump back) vs. "fear" as the motivation for complex behaviors (hear UPS truck, assume intruder into territory, leave garage, accost intruder, do not allow intruder to leave, etc.) What is the fear of, in that case? And when does it start, and how many times does have to that happen until the dog feels no fear anymore? Most dogs don't look scared when they bark at people outside their yard; they look more happy or determined or something, or maybe they aren't feeling anything then, just having a reflex, and when the person comes in they either become happy if they like people or fearful if they don't. Maybe I'll start a thread about that for people who think it's an interesting to discuss. (I assume there are people here who just like to talk about dog stuff; maybe not.)
Unfortunately, my discussion was perceived as arguing instead of trying to understand, and as denial of my problem, which obviously I wouldn't be asking for advice if I didn't know there was one, and as wasting peoples' time, which I feel bad about. I don't want to waste anybody's time, and good advice is worth a lot, especially when people are nice enough to give it for free to strangers for the sake of the dog.
I really think marker training is cool, and would like to learn how to do it.
The situation is what it is now; I mean it can continue forever without any danger to people, so no I didn't consider it urgent. I wish I could convince you that it's not urgent from Mondo's POV, because he just isn't in these stressful situations very often at all. Never at home anymore, because he can't go where people might be. (Even that was rare; just a couple times in four months.) We don't see many people when we go out, and actually most people don't scare him, plus he has gotten a lot, lot better with that. He's not neurotic at all. Of course I stupidly showed a video of him pre-walk that makes him look like a blood-thirsty fiend, but most dogs who aren't owned by dog-trainers start telling us when it's time to go, if they don't think we are moving fast enough. But showing a video of him laying around like he does most of the time would be kind of boring. Maybe I'll take a camera and walk where we might see people, so you can see he is not a quivering ball of nerves all the time, not at all. If Mondo is unhappy because he hasn't got a good pack leader, the vast majority of dogs are unhappy. I just don't think that's true; part of why I like him so much is how happy he is all the time (except when delivery men come.)
I know people here know the difference between a really smart dog and an average dog--Mondo is smart, very smart. Even with my bad training, seriously, I taught him to bark and growl on command in one session, and then taught him if did when I didn't tell him to, I would interpret that as meaning he wanted to go outside with one time of putting him outside. After he bark/growled at me for no reason, I said, "Outside!?", and put him out. When I let him back in, he tested it, giving the tiniest little growl: "grr?". I said, "Outside?", and he looked away so fast and didn't do that anymore. Now, when he wants to get my attention but not go outside, he gives the tiniest little whispered noise, like he's barely clearing his throat. I reward him with looking at him, which I don't know if that's bad or not; he is controlling me, but it's pretty minor, more like a communication.
If things work, they work; it doesn't matter who is right about the philosophy behind them, if all you want is results. If that is true, I may be able to learn, if I can keep my mouth shut. Another problem is that I don't know if I can go as fast as peole expect me to. People seemed to think I was moving very slowly. I guess since I don't feel under any pressure or stress about this, and don't think Mondo is suffering (he's not, please believe me), and also a lot of the advice was things that you do over time, so I don't know how I can instantly change things like that.
Thanks again to everybody who tried to help me.