pfSense

When you have a lot of rules in the firewall section, you can visually seperate them with seperators (one of the new features I really like!). A nice thing to have would be to able to collapse and expand the rules, that are "assigned" to a seperator.

Conceptional idea: You click on a seperator and it will collapse (with a visual indicator, that that section is collapsed). Every item from the seperator you click on, to the next seperator (or the end of the list) will be collapsed. Every other item should be unaffected. When you click again on the seperator, the items will expand again and show up.
You can collapse multiple seperators (so, this means no "accordion").

I think this feature will be usefull even for a small number of items (e.g. less than 20), but even more for a lot of rules (more than 50)