The FA/18 mod uses the Seagull Fast-Forward key (under development) for its afterburner button, which is convenient since I hadn't already bound it to something else. Perhaps using a similar key for this would work well? (i.e. one of the keys on the Development page). If you set it to the auto-hover key, some people already have it bound to a joystick button that isn't in a convenient place for pressing it as often as the crosshair action key would need to be used. I think it's important to have it set to something that would never be used in the air by a plane or helicopter, since otherwise you risk conflicting with someone's existing keybindings.
Another option is to just set a key such as E or left Ctrl in a userconfig configuration file, which would allow people to change it if it doesn't work for them.
