change anchor image from command line

[ChameleonScales]

Hi,
Is there a command to set the anchor image (position, exposure) to the n'th image in the list?
In my case I would like to set it to the 7th image, no matter its filename.

[T. Modes]

In the context menu on the image in the Photo tabs there is "Anchor this image for position" and "Anchor this image for exposure".

Or do you refer to a command line tool? This is currently not possible - there was no demand for this until now. I will add it.

[ChameleonScales]

Thank you. Yes I was talking about a terminal command line.
The reason I would like to have this is because I often perform batch processing of panoramic series and I would like my generated panoramas to be centered properly.

My panoramas are made of 15 photos and the 7th is in the middle. I would like the center of this 7th photo to be the center of the panorama, but when I run my commands, there's always an offset somewhere between 10 and 20 degrees and I think it's due to the first image in each series to be the anchor by default instead of the middle image.

[ChameleonScales]

Sorry I meant 8th image, lol.

Anyway, is there maybe a way to do it using the batch processor?