On some sites I've got many userscripts. To enable/disable many of those, I have to open the monkey menu many times. When a menu contains multiple checkboxes, it is maybe better experience to keep the menu open until the user clicks outside the menu and it loses focus.
Can you help me understand your use case? Why do you need to enable/disable many scripts? Why do you need to do so frequently?
I've got one private situation where I need to switch between multiple userscripts.
Another situation mite be testing with multiple userscripts that work on a particular page.
I'm closing this issue as it's not standard Fx behavior and can be fixed by going to the userscripts listing.