I am looking at a typical restriction form right now and not only can the doctor write in their own, the categories listed are cannot perform:
bending, climbging, computer, driving, grasping, hand motion, kneeling, operate heavy machinery, push/pulling, reaching above shoulder, sitting, sports, squatting, standing, twisting, walking, lifting.
The doctor then checks the box and fills out the area for "Max minutes per hour" and "Max hours per shift" if applicable for each task