Group fields - such as image, description, date - and then allow for an option to repeat them.
I would love to see a repeat group with the ability to add, delete or reorder (With options in the fields admin to choose which of these to allow on the user interface) and the option to choose a group of fields to repeat. So you create an image field, an image description field, an image date field and then create a repeat group and use these image fields then on the user interface you can add an image and the description and date then press repeat to create another group of fields to choose another image. Other options like minimum, maximum, repeat interval, e.t.c. in the fields admin to control the user interface.
Similar to the GroupX in Seblod.
Maybe this could be done better with sub-tables/forms.