For clarification, I'm asking for an option inside your menu to enable only automatic operator selection because I can't enable the full assistance service mode as an fslabs user.
You mean you would like to skip the ground operator selection automatically ? That can be achieved very easily right now: if you select all parking spot on the airport, and insert a SINGLE code for a ground operator (or remove the existing ones, except one), GSX will automatically use that one, skipping the menu, since it wouldn't make any sense to show a menu with just one choice.
In addition to that, you should keep in mind that every menu in GSX has a timeout, after a few seconds the menu will close by selecting the choice which was labeled with "[GSX default]", we made it this way, and made the timeout for the ground operator fairly short, for the precise reason of not forcing you to click something when not extra necessary.
In any case, those are only the suggestions you can use NOW. That doesn't mean we won't consider adding this option as well.