No problems Nobody comes to this world with all the knowledge, it'd be pretty boring otherwise
As obsolum says, powersteering helps a lot! To be simple, it is a set of hydraulic pistons in each side of the steering rack that help multiply the strength of the steering inputs.
A good comparison my father gave me some years ago is that for instance, without powersteering, it'd be a pain to turn the steering wheel of an old mercedes when standing still (speed=0), if you are bodybuilded like Schwarzenegger! An averagely muscular person would probably not even be able to steer without moving and powersteering
On race cars, usually powersteering is chopped off since it is quite heavy, and with the slicks the steering of cars can get pretty damn heavy !
I guess (I repeat, I guess !) that LFS already simulates the FFB level with the different tires, and does it also with the weight and the aero. But I repeat again, it's a guess from my memories back in the time I still had my G25 Your program is an interesting idea ! I'll try it when I'll be back in France with my G25