I have a set of pictures in my images/header folder, and like to temporarily set another set of pictures for some weeks. I wouldn't like to download/delete/upload etc. every time.
So I think I could upload the new pictures in a folder under images/header/ and edit atahualpa settings.
Question is, how can I do that, or is there any easier way? (Maybe it is possible in newer versions? - I am using 3.5.3)

The header image path is set so I know of no way to have a holding spot for images you want to use later. There may be some plugins that could offer that functionality.

And can you tell me where can I edit the path? (an ini or php file, or in the database etc.)

I don't know. You would have to search through the theme files to determine that. I never mess with the theme files except for bug fixes as it makes upgrading more of a hassle.

Yes, I know it is a hassle, but I don't update theme often, but would like to change this path 1-2 times per month. I wait for some days (may anyone tell a solution), then try to find by myself.

lines 28 and 29 of bfa_rotating_header_images.php is one place

Thanks, a few days and I'll try it!

Works perfectly!