Though the control forces do increase with speed, they can also increase with G, and vary near the stall (in the angle of attack - not speed sense). There are also variations due to trim and flaps use, and landing gear position. I would think that this would be a very complex combination of conditions to duplicate in a sim. (But I'm no expect on sims)
If you're taking on such a task, you owe it to yourself to do some flying, and begin to appreciate these forces first hand (pun intended).