Current questions and answers regarding the map editor.

I think you should have read my question more carefully (or even better, the answers to it).
And thank you for the program! :)

Now, let me explain what you didn't understand: I wasn't answering your question; I wanted to solve the problem you highlighted and gave you a link to something similar, but in Russian!
+ The program's help section contains all the scripts and Russian descriptions for them.
But since that's not what you need, and you need something else, then

2. Now the question: How do I assign an army of 1000 or more to a hero or garrison?

why do you need scripts?????
On the left, when selecting a hero or object, there is a field called "creatures" or something like that; you can write any number there, even 100,000.

3. Here, it's more out of curiosity: Can I create my own specializations for heroes? If so, how?

Yes, you can create as many as you want, but only at the script level and practically only in single-player! I won't go into detail. You need to know the scripts well. :)