That are great news Mika!
I am pretty new at Laminar Research, so I did contact the team to get more knowledge about the force feedback interface.
X-Plane does come with an aircraft editor. It has also features to enter some data about force feedback.
Yes, real aircrafts feel pretty different. It depends on the shape and size of the control surfaces, whether they are moved via cables, hydraulics or by electrical drives - called fly by wire. XPForce seems to simulate already a lot of effects.
As mentioned, XPForce may be a good starting point. I am waiting for more information on the X-Plane default force feedback support. Effects could improved and extended later. We can learn so much from the racing games, for example about different ground surfaces.
For our project it would be essential to know if the IONI system will be the way to go, so we can order electronics and motors and build them into the framework. As a first step it would even be thinkable to just simulate a centering spring - as we are using on our other simulator.
As mentioned above - if you are interested in this project too, I could visit you at the at the SPS/IPC Drives next week.