I agree with you that it is nice to have specifics, but let me use the example to clarify what I mean by the use of mood, on the subject of agitato in this scherzo. The agitato appears at m. 492, but it parallels a section with the same melody and similar figuration at m.m. 310 and 412. First off, when I had my first lesson on this piece, my teacher turned to the agitato and said, "Can you play agitated without speeding up?" Naturally, I could, because I have a great agitato (

) and have to work more on being lyrical. However, the other sections with this melody are not agitato, they're actually espressivo. I played all three sections in the same tempo, as my teacher asked, and in the espressivo I brought out the soprano and made longer lines while in the agitato I brought out the alto and followed the much shorter phrasing Chopin has indicated. They obviously didn't sound the same, especially since I played the espressivo pp as indicated a few bars before, and the agitato f as indicated a few bars before, but both still had an agitated feel to them. After puzzling over it for a while, my teacher finally caught that I was rushing the triplets in all sections, and while it was fine for the agitato section, it was too uneasy for the espressivo. I didn't change the overall tempo in either section, but I let the triplets in the espressivo expand to their full value and the problem was fixed. So, in the end, I do believe there are specific things you do to change the mood in these places, but you need to think beyond basic tempo markings, dynamics, and articulations that the composer could have easily indicated otherwise. In addition, the changes you make for different moods vary from piece to piece.
In the way that relates to con anima, I would approach it this way: does the music here have soul/spirit? No? Why not? Is there something too robotic about the playing? Does it get a little off-kilter somewhere? Is there something in the music I am/the student is not observing? Are any notes swallowed up? Are any rhythmic values distorted by the rubato? In other words, the marking is not like crescendo, where you can say "Yes, I am getting louder" or piu mosso, where you can say "Yes, I am getting faster." It's like cooking. You taste it, and if it isn't good, you do some sleuthing to figure out what ingredients are too present and what ingredients are missing. Chopin can trust that all interpreters will understand the feeling as the same thing when he writes something like con anima or agitato, and the slight differences in meaning from person to person are what makes listening to multiple interpretations of the same piece an enjoyable experience.
This is, at least, how I interpret mood markings. You know it when you hear it, but you have to tinker with the musical elements a bit to get it to sound just right. And as a response to you, what do you do when you tell a student to play the con anima a little faster and it comes out agitato, or the agitato a little faster and it comes out con anima? I think this would be a lot easier to understand if we could see teaching demonstrations...
Anyways, I think we agree, except that I would trust instinct and intuition until it fails, and then go into technical detail, but that's a difference of learning styles, and I don't think one is better than the other. (Well, I do,

but it's certainly not worth arguing over.) As far as the info on Rubinstein goes, it was in the Grove dictionary. I had to research him and write a short bio for my piano journals this semester. And you might notice that he and I interpret the espressivo differently. I find his too unsettling for my taste, but overall I do enjoy his performance very much.