We need more control over spoiler/speedbrake deployment, affecting both animation and the flight model. For example, the A320 has 4 spoiler panels on each wing. All spoilers are available for roll control (with max deflection of 35 degrees) and all are used as ground spoilers at their full defection. But in flight, only panels 2, 3, and 4 are used on each side, and their deflection angles depend on whether the autopilot is engaged or not. With autopilot engaged, spoilers 3 and 4 max deflection is 25 degrees, while for 2 it is 12.5 degrees. In manual flight, the max deflection angles are: 40 for 3 and 4, and 20 for 2. The max deflection is reached with autopilot engaged when the lever is in its halfway position with no further deflection if it is moved from there to the full position (or anywhere in between).
Being able to define & dynamically change the position each of these separate spoilers and have them affect the flight model would definitely be necessary, especially for integration with hydraulics and fly-by-wire systems.
Furthermore, being able to define parts of the aircraft fuselage that can affect the flight model, including drag, would be helpful, including the ability to set dynamic objects, such as retractable landing lights which are present on many airliners and do create noticeable drag when deployed.