I organize my bookmarks nested, and frequently connect multiple networks to scan. Currently I hold the control key to append, but a better solution would be a tick box beside each entry, so you can turn them on or off individually, or tick the root heading to add that group. I attached example image
Unfortunately I can't make the check marks there as the menu is not designed to work this way. However, I have added a menu item in every group that allows you to select all items in that group at once.
Thats a good alternative Andrew thanks. I've tested and works for me, however, just one small addition if possible. Would it be possible to be able to hold the CTRL key to append "All the above" to whatever is already loaded?