So I have been thinking of making a rig to drop objects (like parachutes) from my mini quad. I have done this previously with a plane, where I just wired the servo to the receiver and assigned the channel to a switch. This would not work with a mini quad though, since all signals are sent through the iBus signal wire. How would I go about wiring the servo to my flight controller, and how would I set a certain switch to move the servo? Any help appreciated!

Check out "servo tilt" control. Does exactly what you want.