I think its important to test whether it is a structural problem or a biomechanical problem. If it is biomechanical then it may be possible to alter, although if the patient has no symptoms there should be no reason to in my opinion.

Test for femoral anteversion. Patient in supine, palpate the greater trochanter and internally/externally rotate the femur until the greater trochanter is at its most lateral point. From this position check the alignment of the kneecap- if it is vertical then no excessive anteversion is present (theoretically).

If you have cleared femoral anteversion the next thing to look at is tibial torsion. With the tibial tuberosity facing vertical in supine does the foot internally rotate (excessively)? If so this suggests either tibial torsion or perhaps tightness of the supinators.

If you think its a proximal biomechanical problem have a look for tightness of hip adductors/internal rotators and for weakness / poor control of the external rotators.

If you think its a distal biomechanical problem is it due to tight supinators or weak pronators?