Organize Field Parameters using Display Folders

It would be great to add something similar to the "Display Folder" functionality that currently exists for fields, such that one could organize or group Field Parameters (and even tables while you're at it!).

Field Parameters are amazingly useful, and so I'm finding that I am creating many of them within the same report. They show up in the data model view similar to tables, which means that there is no way to visually organize them in the list of the "Fields" pane, and I find I'm spending a lot of time searching for the right one. Display folders would fix it!