Portfolio Checklist sub categories

It would be great to be able to create categories within a Portfolio Checklist and assign points and/or minimum items to these.

One example is a simple, standard 100 point Evidence of Identity checklist where only one item can be from the first category (passport, birth certificate etc) and the remaining points must be from the second or third category.

Another would be where multiple items could be uploaded within a sub-category, but that category only accounts for a certain amount of points for the whole checklist. At the moment these multiple items would each contribute to the total points required.