When adding filters to a combinator, logistics requests, etc, hold CTRL while clicking OK and the dialog will stay open to select another after adding the current selection.
Various interfaces allow you to select multiple items or signals, such as the constant combinator, logistics request slots, and infinity filters. Adding multiple items here requires a lot of repetitive clicking. I suggest allowing the user to hold CTRL when they submit a selection (click OK, press Enter, double click a item) so the item will get added to the list but the dialog will stay open to select another item for the next filter slot.
This would approximately cut in half the time it takes me to set up these things with a bunch of signals. Maybe a different ratio for other people, but still a lot of unnecessary clicks saved.