Tell your PT you'd like some intrinsic foot muscle exercises (those are for the little muscles that are in the foot itself) and some extrinsic foot muscle exercises (muscles that are in your lower leg, but have tendons going into the foot.)

Ask her to teach you closed-chain lower extremity (including pelvis in there) posture exercises. (closed-chain will work balance and proprioception, too, so you get more bang for your buck!)

I wouldn't ask her to post your Superfeet until you have broken them in/strengthened your feet to the point that you can wear them all the time. If she hasn't been trained in posting, don't worry. She probably knows someone who can do it. At the very least she can check your foot/ankle posture and functional positions when you wear the Superfeet and she should be able to tell you if you even need to have them posted.