PHPRunner 10.9 - question on thumbnails ordering

I don't know if anyone has come across this one.

I have a new requirement to give the ability to the end user to sort the order of the thumbnails in a picture field.
When they click on the picture field, they want the right and left arrows to show the pics in a certain order within that record.

Just to be clear I understand how to add the sort field for a list page to drag and drop records on a list page that is already included in runner.

There maybe something that is included in runner to sort the pics but I have not come across this yet.

Any direction is greatly appreciated.

Thanks
Paul