Thanks, Lucia, but I am afraid that “intuition” is not as universal as we sometimes suppose… At least, mine must be atrophied! 
To sum it up: I feel that the possibilities of the software are great, but controlling them is just a question of luck…
At this moment, I am trying to align those 2500 frames from GoPro dron flight. I cannot get a good result (less than 50% aligned, someimes end in errors,…), and I don’t know if changes I make on the parameters of alignment settings are improving or worsening it.
I mean: is there some kind of “optimal combination” for certain kinds of models? Or some kind of “rules” of this type: “if you have many frames, it’s beter to increase maximum no. of features per megapixel”, or something like that, for each parameter… I don’t know, I sometimes feel I make chages just to see that each result is worse than the former one… (By the way, is it possible to return to “factory settings” or something like that?)