Frequency of motion triggered still images.

Hi. If I understand it correctly, when saving motion triggered still images, it takes still image every second of motion. Is there (or can there be) any way of setting this frequency? I would like (for example) a picture of the motion every 10 seconds. The pictures are (and must be) in 4k so I do this because of space requirements. If there is a way to code this please point me in a direction and I could do it and submit it. Thanks