Hi Martin!
Thank you so much for the kind words about my program.
As I already said, I'm not a programmer and the code was written by the AI.

But...
I asked it to do exactly what I wanted (image manipulation) and what I was desperately missing.

Of course, I don't have the nerve to ask Mike to build such mechanics into MOI3D (hahaha!),
but I'm sure those who have encountered the same problem as me will enjoy working with this program.

I'll repeat: I selected a point in the photo and indicated the location where it should be in reality (the yellow marker).
If you Ctrl+click, it immediately "freezes" (this can be done later or when initially placing markers).
If you click the blue marker with Ctrl+click again, it "unfreezes."
If you click the yellow marker again, it turns red and can be deleted via the "Delete" menu.
Then click "Update" and the image changes.
If something's wrong, adjust it until you get the desired result and click "Done!"

At the same time, the corrected version is saved next to the original photo.