MDL-27156 introduced the ability to allow certain users to ignore file size limits. This works great with file repositories for example. When uploading however there exists the possibility that they will upload something so large that it exceeds PHP's post_max_size. At that point the posted data gets chopped and the user will likely get an error saying that their sess key is missing.
We need the ability to say "for this repository the user can access files of any size. For this repository the course and activity file size limits dont apply but PHP's size limits do."